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1 ## Copyright (C) 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2002, 2003, |
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2 ## 2004, 2005, 2006, 2007 John W. Eaton |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} num2str (@var{n}) |
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22 ## @deftypefnx {Function File} {} num2str (@var{x}, @var{precision}) |
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23 ## @deftypefnx {Function File} {} num2str (@var{x}, @var{format}) |
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24 ## Convert a number to a string. This function is not very flexible. |
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25 ## For better control over the results, use @code{sprintf} |
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26 ## (@pxref{Formatted Output}). |
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27 ## @seealso{sprintf, int2str} |
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28 ## @end deftypefn |
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29 |
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30 ## Author: jwe |
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31 |
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32 function retval = num2str (x, arg) |
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33 |
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34 if (nargin != 1 && nargin != 2) |
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35 print_usage (); |
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36 endif |
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37 |
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38 if (ischar (x)) |
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39 retval = x; |
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40 elseif (isempty (x)) |
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41 retval = ""; |
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42 elseif (iscomplex (x)) |
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43 if (nargin == 2) |
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44 if (ischar (arg)) |
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45 fmt = strcat (arg, "%-+", arg(2:end), "i"); |
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46 else |
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47 if (isnumeric (x) && round (x) == x && abs (x) < (10 .^ arg)) |
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48 fmt = sprintf ("%%%dd%%-+%ddi ", arg, arg); |
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49 else |
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50 fmt = sprintf ("%%%d.%dg%%-+%d.%dgi", arg+7, arg, arg+7, arg); |
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51 endif |
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52 endif |
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53 else |
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54 ## Setup a suitable format string |
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55 if (isnumeric (x) && round (x) == x && abs (x) < 1e10) |
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56 if (max (abs (real (x(:)))) == 0) |
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57 dgt1 = 2; |
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58 else |
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59 dgt1 = ceil (log10 (max (max (abs (real (x(:)))), |
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60 max (abs (imag (x(:))))))) + 2; |
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61 endif |
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62 dgt2 = dgt1 - (min (real (x(:))) >= 0); |
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63 |
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64 if (length (abs (x) == x) > 0) |
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65 fmt = sprintf("%%%dg%%+-%dgi ", dgt2, dgt1); |
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66 else |
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67 fmt = sprintf("%%%dd%%+-%ddi ", dgt2, dgt1); |
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68 endif |
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69 elseif (isscalar (x)) |
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70 fmt = "%.6g%-+.6gi"; |
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71 else |
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72 fmt = "%11.6g%-+11.6gi"; |
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73 endif |
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74 endif |
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75 |
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76 ## Manipulate the complex value to have real values in the odd |
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77 ## columns and imaginary values in the even columns. |
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78 sz = size (x); |
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79 nc = sz(2); |
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80 nd = ndims (x); |
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81 perm = fix ([1:0.5:nc+0.5]); |
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82 perm(2:2:2*nc) = perm(2:2:2*nc) + nc; |
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83 idx = cell (); |
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84 for i = 1:nd |
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85 idx{i} = 1:sz(i); |
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86 endfor |
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87 idx{2} = perm; |
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88 x = horzcat (real (x), imag (x)); |
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89 x = x(idx{:}); |
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90 |
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91 fmt = strcat (deblank (repmat (fmt, 1, nc)), "\n"); |
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92 tmp = sprintf (fmt, permute (x, [2, 1, 3:nd])); |
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93 |
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94 ## Put the "i"'s where they are supposed to be. |
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95 while (true) |
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96 tmp2 = strrep (tmp, " i\n", "i\n"); |
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97 if (length (tmp) == length (tmp2)) |
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98 break; |
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99 else |
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100 tmp = tmp2; |
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101 endif |
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102 endwhile |
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103 while (true) |
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104 tmp2 = strrep (tmp, " i", "i "); |
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105 if (tmp == tmp2) |
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106 break; |
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107 else |
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108 tmp = tmp2; |
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109 endif |
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110 endwhile |
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111 |
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112 tmp(length (tmp)) = ""; |
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113 retval = strtrim (split (tmp, "\n")); |
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114 else |
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115 if (nargin == 2) |
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116 if (ischar (arg)) |
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117 fmt = arg; |
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118 else |
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119 if (isnumeric (x) && round (x) == x && abs (x) < (10 .^ arg)) |
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120 fmt = sprintf ("%%%dd ", arg); |
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121 else |
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122 fmt = sprintf ("%%%d.%dg", arg+7, arg); |
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123 endif |
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124 endif |
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125 else |
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126 if (isnumeric (x) && round (x) == x && abs (x) < 1e10) |
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127 if (max (abs (x(:))) == 0) |
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128 dgt = 2; |
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129 else |
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130 dgt = floor (log10 (max (abs(x(:))))) + (min (real (x(:))) < 0) + 2; |
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131 endif |
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132 if (length (abs (x) == x) > 0) |
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133 fmt = sprintf ("%%%dg ", dgt); |
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134 else |
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135 fmt = sprintf ("%%%dd ", dgt); |
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136 endif |
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137 elseif (isscalar (x)) |
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138 fmt = "%11.5g"; |
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139 else |
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140 fmt = "%11.5g"; |
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141 endif |
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142 endif |
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143 fmt = strcat (deblank (repmat (fmt, 1, columns (x))), "\n"); |
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144 nd = ndims (x); |
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145 tmp = sprintf (fmt, permute (x, [2, 1, 3:nd])); |
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146 tmp(length (tmp)) = ""; |
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147 retval = strtrim (split (tmp, "\n")); |
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148 endif |
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149 |
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150 endfunction |
