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1
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1 /* |
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2 |
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2847
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3 Copyright (C) 1996, 1997 John W. Eaton |
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1
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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1315
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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1
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20 |
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21 */ |
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22 |
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240
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23 #ifdef HAVE_CONFIG_H |
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1192
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24 #include <config.h> |
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1
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25 #endif |
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26 |
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3716
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27 #include <cerrno> |
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1343
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28 #include <climits> |
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1346
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29 #include <cstring> |
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1343
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30 |
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3503
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31 #include <fstream> |
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32 #include <iostream> |
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33 #include <strstream> |
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1728
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34 #include <string> |
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35 |
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1350
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36 #ifdef HAVE_UNISTD_H |
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2442
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37 #ifdef HAVE_SYS_TYPES_H |
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1
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38 #include <sys/types.h> |
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2442
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39 #endif |
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1
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40 #include <unistd.h> |
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41 #endif |
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367
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42 |
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3566
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43 // Include setjmp.h, not csetjmp since the latter might only define |
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44 // the ANSI standard C interface. |
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45 |
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46 #include <setjmp.h> |
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47 |
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138
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48 #if defined (HAVE_TERMIOS_H) |
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49 #include <termios.h> |
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50 #elif defined (HAVE_TERMIO_H) |
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1
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51 #include <termio.h> |
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138
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52 #elif defined (HAVE_SGTTY_H) |
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1
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53 #include <sgtty.h> |
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54 #else |
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55 LOSE! LOSE! |
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56 #endif |
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57 |
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58 #include "SLStack.h" |
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59 |
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3040
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60 #include "dir-ops.h" |
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61 #include "file-ops.h" |
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2926
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62 #include "file-stat.h" |
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1651
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63 #include "oct-cmplx.h" |
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2926
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64 #include "oct-env.h" |
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3040
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65 #include "pathsearch.h" |
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1755
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66 #include "str-vec.h" |
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1651
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67 |
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2492
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68 #include <defaults.h> |
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1352
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69 #include "defun.h" |
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70 #include "dirfns.h" |
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71 #include "error.h" |
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72 #include "gripes.h" |
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73 #include "input.h" |
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1742
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74 #include "oct-hist.h" |
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1750
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75 #include "oct-obj.h" |
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1352
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76 #include "pager.h" |
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1690
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77 #include "sysdep.h" |
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1750
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78 #include "toplev.h" |
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1
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79 #include "unwind-prot.h" |
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1352
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80 #include "utils.h" |
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81 #include "variables.h" |
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1
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82 |
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3354
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83 // Should expressions like ones (-1, 5) result in an empty matrix or |
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84 // an error? A positive value means yes. A negative value means |
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85 // yes, but print a warning message. Zero means it should be |
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86 // considered an error. |
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87 static int Vtreat_neg_dim_as_zero; |
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88 |
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1
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89 // Top level context (?) |
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90 extern jmp_buf toplevel; |
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91 |
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581
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92 // Return to the main command loop in octave.cc. |
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93 |
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3350
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94 void |
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1
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95 jump_to_top_level (void) |
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96 { |
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2985
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97 unwind_protect::run_all (); |
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1
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98 |
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99 longjmp (toplevel, 1); |
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100 } |
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101 |
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102 int |
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3523
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103 almost_match (const std::string& std, const std::string& s, int min_match_len, |
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526
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104 int case_sens) |
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1
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105 { |
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1755
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106 int stdlen = std.length (); |
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107 int slen = s.length (); |
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1
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108 |
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109 return (slen <= stdlen |
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110 && slen >= min_match_len |
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287
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111 && (case_sens |
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1755
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112 ? (strncmp (std.c_str (), s.c_str (), slen) == 0) |
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3350
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113 : (octave_strncasecmp (std.c_str (), s.c_str (), slen) == 0))); |
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287
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114 } |
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115 |
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581
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116 // Ugh. |
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117 |
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287
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118 int |
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3523
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119 keyword_almost_match (const char * const *std, int *min_len, const std::string& s, |
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287
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120 int min_toks_to_match, int max_toks) |
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121 { |
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122 int status = 0; |
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123 int tok_count = 0; |
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124 int toks_matched = 0; |
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125 |
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1755
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126 if (s.empty () || max_toks < 1) |
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287
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127 return status; |
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128 |
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1755
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129 char *kw = strsave (s.c_str ()); |
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287
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130 |
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131 char *t = kw; |
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132 while (*t != '\0') |
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133 { |
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134 if (*t == '\t') |
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135 *t = ' '; |
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136 t++; |
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137 } |
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138 |
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139 char *beg = kw; |
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140 while (*beg == ' ') |
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141 beg++; |
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142 |
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143 if (*beg == '\0') |
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144 return status; |
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145 |
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146 |
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3072
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147 const char **to_match = new const char * [max_toks + 1]; |
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148 const char * const *s1 = std; |
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149 const char **s2 = to_match; |
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287
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150 |
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526
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151 if (! s1 || ! s2) |
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287
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152 goto done; |
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153 |
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154 s2[tok_count] = beg; |
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155 char *end; |
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526
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156 while ((end = strchr (beg, ' ')) != 0) |
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287
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157 { |
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158 *end = '\0'; |
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159 beg = end + 1; |
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160 |
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161 while (*beg == ' ') |
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162 beg++; |
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163 |
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164 if (*beg == '\0') |
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165 break; |
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166 |
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167 tok_count++; |
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168 if (tok_count >= max_toks) |
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169 goto done; |
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170 |
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171 s2[tok_count] = beg; |
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172 } |
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526
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173 s2[tok_count+1] = 0; |
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287
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174 |
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175 s2 = to_match; |
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176 |
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177 for (;;) |
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178 { |
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179 if (! almost_match (*s1, *s2, min_len[toks_matched], 0)) |
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180 goto done; |
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181 |
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182 toks_matched++; |
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183 |
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184 s1++; |
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185 s2++; |
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186 |
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187 if (! *s2) |
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188 { |
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189 status = (toks_matched >= min_toks_to_match); |
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190 goto done; |
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191 } |
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192 |
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193 if (! *s1) |
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194 goto done; |
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195 } |
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196 |
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197 done: |
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198 |
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199 delete [] kw; |
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200 delete [] to_match; |
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201 |
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202 return status; |
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1
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203 } |
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204 |
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2234
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205 // Return non-zero if either NR or NC is zero. Return -1 if this |
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206 // should be considered fatal; return 1 if this is ok. |
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207 |
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208 int |
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209 empty_arg (const char *name, int nr, int nc) |
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210 { |
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211 int is_empty = 0; |
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212 |
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213 if (nr == 0 || nc == 0) |
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214 { |
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215 int flag = Vpropagate_empty_matrices; |
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216 |
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217 if (flag < 0) |
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218 { |
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219 gripe_empty_arg (name, 0); |
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220 is_empty = 1; |
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221 } |
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222 else if (flag == 0) |
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223 { |
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224 gripe_empty_arg (name, 1); |
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225 is_empty = -1; |
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226 } |
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227 else |
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228 is_empty = 1; |
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229 } |
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230 |
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231 return is_empty; |
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232 } |
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233 |
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581
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234 // See if the given file is in the path. |
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235 |
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3536
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236 std::string |
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3523
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237 search_path_for_file (const std::string& path, const std::string& name) |
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686
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238 { |
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3174
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239 dir_path p (path); |
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686
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240 |
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2926
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241 return octave_env::make_absolute (p.find (name), octave_env::getcwd ()); |
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686
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242 } |
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243 |
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3195
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244 DEFUN (file_in_loadpath, args, , |
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3446
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245 "-*- texinfo -*-\n\ |
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246 @deftypefn {Built-in Function} {} file_in_loadpath (@var{name})\n\ |
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3195
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247 \n\ |
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3446
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248 Look up @var{name} in Octave's @code{LOADPATH}.\n\ |
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249 @end deftypefn\n\ |
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250 @seealso{file_in_path}") |
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3195
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251 { |
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252 octave_value_list retval; |
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253 |
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254 int argc = args.length () + 1; |
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255 |
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256 string_vector argv = args.make_argv ("file_in_loadpath"); |
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257 |
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258 if (error_state) |
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259 return retval; |
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260 |
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3225
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261 if (argc == 2) |
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3195
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262 retval = octave_env::make_absolute (Vload_path_dir_path.find (argv[1]), |
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263 octave_env::getcwd ()); |
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264 else |
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265 print_usage ("file_in_loadpath"); |
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266 |
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267 return retval; |
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268 } |
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269 |
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1957
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270 DEFUN (file_in_path, args, , |
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3301
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271 "-*- texinfo -*-\n\ |
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272 @deftypefn {Built-in Function} {} file_in_path (@var{path}, @var{file})\n\ |
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273 Return the absolute name name of @var{file} if it can be found in\n\ |
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274 @var{path}. The value of @var{path} should be a colon-separated list of\n\ |
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275 directories in the format described for the built-in variable\n\ |
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276 @code{LOADPATH}.\n\ |
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277 \n\ |
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278 If the file cannot be found in the path, an empty matrix is returned.\n\ |
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279 For example,\n\ |
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280 \n\ |
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281 @example\n\ |
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282 file_in_path (LOADPATH, \"nargchk.m\")\n\ |
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283 @result{} \"@value{OCTAVEHOME}/share/octave/2.0/m/general/nargchk.m\"\n\ |
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284 @end example\n\ |
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285 @end deftypefn") |
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686
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286 { |
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2086
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287 octave_value_list retval; |
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686
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288 |
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1755
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289 int argc = args.length () + 1; |
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290 |
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1968
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291 string_vector argv = args.make_argv ("file_in_path"); |
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1755
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292 |
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293 if (error_state) |
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294 return retval; |
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686
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295 |
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296 if (argc == 3) |
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297 { |
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3523
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298 std::string fname = search_path_for_file (argv[1], argv[2]); |
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686
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299 |
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1755
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300 if (fname.empty ()) |
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301 retval = Matrix (); |
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302 else |
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686
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303 retval = fname; |
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304 } |
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305 else |
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306 print_usage ("file_in_path"); |
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307 |
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308 return retval; |
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309 } |
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310 |
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3536
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311 std::string |
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3523
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312 file_in_path (const std::string& name, const std::string& suffix) |
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526
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313 { |
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3523
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314 std::string nm = name; |
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526
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315 |
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1755
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316 if (! suffix.empty ()) |
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317 nm.append (suffix); |
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686
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318 |
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3174
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319 return octave_env::make_absolute (Vload_path_dir_path.find (nm), |
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320 octave_env::getcwd ()); |
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526
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321 } |
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322 |
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581
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323 // See if there is an function file in the path. If so, return the |
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324 // full path to the file. |
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325 |
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3536
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326 std::string |
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3523
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327 fcn_file_in_path (const std::string& name) |
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526
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328 { |
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3523
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329 std::string retval; |
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908
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330 |
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1755
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331 int len = name.length (); |
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332 |
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333 if (len > 0) |
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334 { |
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335 if (len > 2 && name [len - 2] == '.' && name [len - 1] == 'm') |
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336 retval = file_in_path (name, ""); |
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908
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337 else |
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1755
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338 retval = file_in_path (name, ".m"); |
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908
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339 } |
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1755
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340 |
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341 return retval; |
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526
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342 } |
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343 |
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581
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344 // See if there is an octave file in the path. If so, return the |
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345 // full path to the file. |
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346 |
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3536
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347 std::string |
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3523
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348 oct_file_in_path (const std::string& name) |
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572
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349 { |
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3523
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350 std::string retval; |
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908
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351 |
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1755
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352 int len = name.length (); |
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353 |
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354 if (len > 0) |
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355 { |
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356 if (len > 2 && name [len - 4] == '.' && name [len - 3] == 'o' |
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908
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357 && name [len - 2] == 'c' && name [len - 1] == 't') |
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1755
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358 retval = file_in_path (name, ""); |
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908
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359 else |
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1755
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360 retval = file_in_path (name, ".oct"); |
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908
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361 } |
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1755
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362 |
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363 return retval; |
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572
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364 } |
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365 |
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3103
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366 // Replace backslash escapes in a string with the real values. |
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367 |
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3536
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368 std::string |
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3523
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369 do_string_escapes (const std::string& s) |
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3103
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370 { |
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3523
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371 std::string retval; |
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3103
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372 |
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373 size_t i = 0; |
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374 size_t j = 0; |
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375 size_t len = s.length (); |
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376 |
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377 retval.resize (len); |
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378 |
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379 while (j < len) |
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380 { |
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381 if (s[j] == '\\' && j+1 < len) |
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382 { |
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383 switch (s[++j]) |
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384 { |
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385 case 'a': |
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386 retval[i] = '\a'; |
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387 break; |
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388 |
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389 case 'b': // backspace |
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390 retval[i] = '\b'; |
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391 break; |
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392 |
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393 case 'f': // formfeed |
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394 retval[i] = '\f'; |
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395 break; |
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396 |
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397 case 'n': // newline |
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398 retval[i] = '\n'; |
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399 break; |
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400 |
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401 case 'r': // carriage return |
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402 retval[i] = '\r'; |
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403 break; |
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404 |
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405 case 't': // horizontal tab |
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406 retval[i] = '\t'; |
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407 break; |
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408 |
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409 case 'v': // vertical tab |
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410 retval[i] = '\v'; |
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411 break; |
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412 |
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413 case '\\': // backslash |
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414 retval[i] = '\\'; |
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415 break; |
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416 |
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417 case '\'': // quote |
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418 retval[i] = '\''; |
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419 break; |
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420 |
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421 case '"': // double quote |
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422 retval[i] = '"'; |
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423 break; |
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424 |
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425 default: |
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426 warning ("unrecognized escape sequence `\\%c' --\ |
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427 converting to `%c'", s[j], s[j]); |
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428 retval[i] = s[j]; |
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429 break; |
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430 } |
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431 } |
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432 else |
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433 { |
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434 retval[i] = s[j]; |
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435 } |
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436 |
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437 i++; |
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438 j++; |
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439 } |
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440 |
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3105
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441 retval.resize (i); |
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3103
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442 |
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443 return retval; |
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444 } |
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445 |
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446 DEFUN (do_string_escapes, args, , |
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3446
|
447 "-*- texinfo -*-\n\ |
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|
448 @deftypefn {Built-in Function} {} do_string_escapes (@var{string})\n\ |
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|
449 Convert special characters in @var{string} to their escaped forms.\n\ |
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450 @end deftypefn") |
|
3103
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451 { |
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452 octave_value retval; |
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453 |
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454 int nargin = args.length (); |
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455 |
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456 if (nargin == 1) |
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457 { |
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458 if (args(0).is_string ()) |
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459 retval = do_string_escapes (args(0).string_value ()); |
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460 else |
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|
461 error ("do_string_escapes: argument must be a string"); |
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462 } |
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463 else |
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464 print_usage ("do_string_escapes"); |
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465 |
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466 return retval; |
|
|
467 } |
|
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468 |
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1755
|
469 const char * |
|
801
|
470 undo_string_escape (char c) |
|
|
471 { |
|
|
472 if (! c) |
|
1755
|
473 return ""; |
|
801
|
474 |
|
|
475 switch (c) |
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|
476 { |
|
|
477 case '\a': |
|
|
478 return "\\a"; |
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|
479 |
|
|
480 case '\b': // backspace |
|
|
481 return "\\b"; |
|
|
482 |
|
|
483 case '\f': // formfeed |
|
|
484 return "\\f"; |
|
|
485 |
|
|
486 case '\n': // newline |
|
|
487 return "\\n"; |
|
|
488 |
|
|
489 case '\r': // carriage return |
|
|
490 return "\\r"; |
|
|
491 |
|
|
492 case '\t': // horizontal tab |
|
|
493 return "\\t"; |
|
|
494 |
|
|
495 case '\v': // vertical tab |
|
|
496 return "\\v"; |
|
|
497 |
|
|
498 case '\\': // backslash |
|
|
499 return "\\\\"; |
|
|
500 |
|
|
501 case '"': // double quote |
|
|
502 return "\\\""; |
|
|
503 |
|
|
504 default: |
|
1755
|
505 { |
|
|
506 static char retval[2]; |
|
|
507 retval[0] = c; |
|
|
508 retval[1] = '\0'; |
|
|
509 return retval; |
|
|
510 } |
|
801
|
511 } |
|
|
512 } |
|
|
513 |
|
3536
|
514 std::string |
|
3523
|
515 undo_string_escapes (const std::string& s) |
|
801
|
516 { |
|
3523
|
517 std::string retval; |
|
801
|
518 |
|
1755
|
519 for (size_t i = 0; i < s.length (); i++) |
|
|
520 retval.append (undo_string_escape (s[i])); |
|
801
|
521 |
|
1755
|
522 return retval; |
|
801
|
523 } |
|
|
524 |
|
1957
|
525 DEFUN (undo_string_escapes, args, , |
|
3361
|
526 "-*- texinfo -*-\n\ |
|
|
527 @deftypefn {Built-in Function} {} undo_string_escapes (@var{s})\n\ |
|
|
528 Converts special characters in strings back to their escaped forms. For\n\ |
|
|
529 example, the expression\n\ |
|
|
530 \n\ |
|
|
531 @example\n\ |
|
|
532 bell = \"\\a\";\n\ |
|
|
533 @end example\n\ |
|
|
534 \n\ |
|
|
535 @noindent\n\ |
|
|
536 assigns the value of the alert character (control-g, ASCII code 7) to\n\ |
|
|
537 the string variable @code{bell}. If this string is printed, the\n\ |
|
|
538 system will ring the terminal bell (if it is possible). This is\n\ |
|
|
539 normally the desired outcome. However, sometimes it is useful to be\n\ |
|
|
540 able to print the original representation of the string, with the\n\ |
|
|
541 special characters replaced by their escape sequences. For example,\n\ |
|
|
542 \n\ |
|
|
543 @example\n\ |
|
|
544 octave:13> undo_string_escapes (bell)\n\ |
|
|
545 ans = \\a\n\ |
|
|
546 @end example\n\ |
|
|
547 \n\ |
|
|
548 @noindent\n\ |
|
|
549 replaces the unprintable alert character with its printable\n\ |
|
|
550 representation.\n\ |
|
|
551 @end deftypefn") |
|
801
|
552 { |
|
2086
|
553 octave_value retval; |
|
801
|
554 |
|
|
555 int nargin = args.length (); |
|
|
556 |
|
3103
|
557 if (nargin == 1) |
|
|
558 { |
|
|
559 if (args(0).is_string ()) |
|
|
560 retval = undo_string_escapes (args(0).string_value ()); |
|
|
561 else |
|
|
562 error ("undo_string_escapes: argument must be a string"); |
|
|
563 } |
|
801
|
564 else |
|
1023
|
565 print_usage ("undo_string_escapes"); |
|
801
|
566 |
|
|
567 return retval; |
|
|
568 } |
|
|
569 |
|
3716
|
570 #if 0 |
|
|
571 |
|
|
572 // Octave could use some way to access the value of ERRNO, but this is |
|
|
573 // probably not the best interface, so don't depend on it... |
|
|
574 |
|
|
575 DEFUN (ERRNO, args, , |
|
|
576 "-*- texinfo -*-\n\ |
|
|
577 @deftypefn {Built-in Function} {@var{system_error_number}} errno ()\n\ |
|
|
578 Return the current value of the system-dependent variable errno.\n\ |
|
|
579 @end deftypefn") |
|
|
580 { |
|
|
581 octave_value retval; |
|
|
582 |
|
|
583 if (args.length () == 0) |
|
|
584 retval = static_cast<double> (errno); |
|
|
585 else |
|
|
586 print_usage ("errno"); |
|
|
587 |
|
|
588 return retval; |
|
|
589 } |
|
|
590 |
|
|
591 #endif |
|
|
592 |
|
2285
|
593 static void |
|
3523
|
594 warn_old_style_preference (bool val, const std::string& sval) |
|
2285
|
595 { |
|
|
596 warning |
|
|
597 ("preference of \"%s\" is obsolete -- use numeric value of %d instead", |
|
|
598 sval.c_str (), (val ? 1 : 0)); |
|
|
599 } |
|
|
600 |
|
2204
|
601 // Check the value of a string variable to see if it it's ok to do |
|
|
602 // something. |
|
|
603 // |
|
|
604 // return of 1 => always ok. |
|
|
605 // return of 0 => never ok. |
|
|
606 // return of -1 => ok, but give me warning (default). |
|
|
607 |
|
|
608 int |
|
3523
|
609 check_preference (const std::string& var) |
|
2204
|
610 { |
|
|
611 int pref = -1; |
|
|
612 |
|
3523
|
613 std::string val = builtin_string_variable (var); |
|
2204
|
614 |
|
|
615 if (val.empty ()) |
|
|
616 { |
|
|
617 double dval = 0; |
|
|
618 if (builtin_real_scalar_variable (var, dval)) |
|
|
619 pref = NINT (dval); |
|
|
620 } |
|
|
621 else |
|
|
622 { |
|
3565
|
623 if (val == "yes" || val == "true") |
|
2285
|
624 { |
|
|
625 warn_old_style_preference (true, val); |
|
|
626 pref = 1; |
|
|
627 } |
|
3565
|
628 else if (val == "never" || val == "no" || val == "false") |
|
2285
|
629 { |
|
|
630 warn_old_style_preference (false, val); |
|
|
631 pref = 0; |
|
|
632 } |
|
2204
|
633 } |
|
|
634 |
|
|
635 return pref; |
|
|
636 } |
|
|
637 |
|
3354
|
638 static void |
|
|
639 check_dimensions (int& nr, int& nc, const char *warnfor) |
|
|
640 { |
|
|
641 if (nr < 0 || nc < 0) |
|
|
642 { |
|
|
643 if (Vtreat_neg_dim_as_zero) |
|
|
644 { |
|
|
645 nr = (nr < 0) ? 0 : nr; |
|
|
646 nc = (nc < 0) ? 0 : nc; |
|
|
647 |
|
|
648 if (Vtreat_neg_dim_as_zero < 0) |
|
|
649 warning ("%s: converting negative dimension to zero", |
|
|
650 warnfor); |
|
|
651 } |
|
|
652 else |
|
|
653 error ("%s: can't create a matrix with negative dimensions", |
|
|
654 warnfor); |
|
|
655 } |
|
|
656 } |
|
|
657 |
|
|
658 void |
|
|
659 get_dimensions (const octave_value& a, const char *warn_for, |
|
|
660 int& nr, int& nc) |
|
|
661 { |
|
|
662 if (a.is_scalar_type ()) |
|
|
663 { |
|
|
664 nr = nc = a.nint_value (); |
|
|
665 } |
|
|
666 else |
|
|
667 { |
|
|
668 nr = a.rows (); |
|
|
669 nc = a.columns (); |
|
|
670 |
|
|
671 if ((nr == 1 && nc == 2) || (nr == 2 && nc == 1)) |
|
|
672 { |
|
3419
|
673 Array<double> v = a.vector_value (); |
|
3354
|
674 |
|
|
675 if (error_state) |
|
|
676 return; |
|
|
677 |
|
|
678 nr = NINT (v (0)); |
|
|
679 nc = NINT (v (1)); |
|
|
680 } |
|
|
681 else |
|
|
682 warning ("%s (A): use %s (size (A)) instead", warn_for, warn_for); |
|
|
683 } |
|
|
684 |
|
|
685 check_dimensions (nr, nc, warn_for); // May set error_state. |
|
|
686 } |
|
|
687 |
|
|
688 void |
|
|
689 get_dimensions (const octave_value& a, const octave_value& b, |
|
|
690 const char *warn_for, int& nr, int& nc) |
|
|
691 { |
|
|
692 nr = a.is_empty () ? 0 : a.nint_value (); |
|
|
693 nc = b.is_empty () ? 0 : b.nint_value (); |
|
|
694 |
|
|
695 if (error_state) |
|
|
696 error ("%s: expecting two scalar arguments", warn_for); |
|
|
697 else |
|
|
698 check_dimensions (nr, nc, warn_for); // May set error_state. |
|
|
699 } |
|
|
700 |
|
3620
|
701 extern int |
|
3622
|
702 octave_format (std::ostream& os, const char *fmt, ...) |
|
3620
|
703 { |
|
|
704 int retval = -1; |
|
|
705 |
|
|
706 va_list args; |
|
|
707 va_start (args, fmt); |
|
|
708 |
|
|
709 retval = octave_vformat (os, fmt, args); |
|
|
710 |
|
|
711 va_end (args); |
|
|
712 |
|
|
713 return retval; |
|
|
714 } |
|
|
715 |
|
|
716 extern int |
|
3622
|
717 octave_vformat (std::ostream& os, const char *fmt, va_list args) |
|
3620
|
718 { |
|
|
719 int retval = -1; |
|
|
720 |
|
3775
|
721 #if defined (__GNUG__) && !CXX_ISO_COMPLIANT_LIBRARY |
|
3620
|
722 |
|
3769
|
723 std::ostrstream buf; |
|
3620
|
724 |
|
|
725 buf.vform (fmt, args); |
|
|
726 |
|
3769
|
727 buf << std::ends; |
|
3620
|
728 |
|
|
729 char *s = buf.str (); |
|
|
730 |
|
3621
|
731 os << s; |
|
|
732 |
|
3620
|
733 retval = strlen (s); |
|
|
734 |
|
3621
|
735 delete [] s; |
|
3620
|
736 |
|
|
737 #else |
|
|
738 |
|
|
739 char *s = octave_vsnprintf (fmt, args); |
|
|
740 |
|
|
741 if (s) |
|
|
742 { |
|
|
743 os << s; |
|
|
744 |
|
|
745 retval = strlen (s); |
|
3621
|
746 |
|
|
747 free (s); |
|
3620
|
748 } |
|
|
749 |
|
|
750 #endif |
|
|
751 |
|
|
752 return retval; |
|
|
753 } |
|
|
754 |
|
3354
|
755 static int |
|
|
756 treat_neg_dim_as_zero (void) |
|
|
757 { |
|
|
758 Vtreat_neg_dim_as_zero = check_preference ("treat_neg_dim_as_zero"); |
|
|
759 |
|
|
760 return 0; |
|
|
761 } |
|
|
762 |
|
|
763 void |
|
|
764 symbols_of_utils (void) |
|
|
765 { |
|
|
766 DEFVAR (treat_neg_dim_as_zero, 0.0, treat_neg_dim_as_zero, |
|
3369
|
767 "-*- texinfo -*-\n\ |
|
|
768 @defvr {Built-in Variable} treat_neg_dim_as_zero\n\ |
|
|
769 If the value of @code{treat_neg_dim_as_zero} is nonzero, expressions\n\ |
|
|
770 like\n\ |
|
|
771 \n\ |
|
|
772 @example\n\ |
|
|
773 eye (-1)\n\ |
|
|
774 @end example\n\ |
|
|
775 \n\ |
|
|
776 @noindent\n\ |
|
|
777 produce an empty matrix (i.e., row and column dimensions are zero).\n\ |
|
|
778 Otherwise, an error message is printed and control is returned to the\n\ |
|
|
779 top level. The default value is 0.\n\ |
|
|
780 @end defvr"); |
|
3354
|
781 } |
|
|
782 |
|
572
|
783 /* |
|
1
|
784 ;;; Local Variables: *** |
|
|
785 ;;; mode: C++ *** |
|
|
786 ;;; End: *** |
|
|
787 */ |
