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1 ## Copyright (C) 2004 by Alois Schloegl <a.schloegl@ieee.org> |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## STR2DOUBLE converts strings into numeric values |
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21 ## [NUM, STATUS,STRARRAY] = STR2DOUBLE(STR) |
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22 ## |
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23 ## STR2DOUBLE can replace STR2NUM, but avoids the insecure use of EVAL |
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24 ## on unknown data [1]. |
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25 ## |
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26 ## STR can be the form '[+-]d[.]dd[[eE][+-]ddd]' |
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27 ## d can be any of digit from 0 to 9, [] indicate optional elements |
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28 ## NUM is the corresponding numeric value. |
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29 ## if the conversion fails, status is -1 and NUM is NaN. |
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30 ## STATUS = 0: conversion was successful |
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31 ## STATUS = -1: couldnot convert string into numeric value |
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32 ## STRARRAY is a cell array of strings. |
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33 ## |
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34 ## Elements which are not defined or not valid return NaN and |
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35 ## the STATUS becomes -1 |
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36 ## STR can be also a character array or a cell array of strings. |
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37 ## Then, NUM and STATUS return matrices of appropriate size. |
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38 ## |
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39 ## STR can also contain multiple elements. |
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40 ## default row-delimiters are: |
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41 ## NEWLINE, CARRIAGE RETURN and SEMICOLON i.e. ASCII 10, 13 and 59. |
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42 ## default column-delimiters are: |
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43 ## TAB, SPACE and COMMA i.e. ASCII 9, 32, and 44. |
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44 ## default decimal delimiter is '.' char(46), sometimes (e.g in |
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45 ## Tab-delimited text files generated by Excel export in Europe) |
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46 ## might used ',' as decimal delimiter. |
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47 ## |
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48 ## [NUM, STATUS] = STR2DOUBLE(STR,CDELIM,RDELIM,DDELIM) |
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49 ## CDELIM .. [OPTIONAL] user-specified column delimiter |
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50 ## RDELIM .. [OPTIONAL] user-specified row delimiter |
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51 ## DDELIM .. [OPTIONAL] user-specified decimal delimiter |
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52 ## CDELIM, RDELIM and DDELIM must contain only |
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53 ## NULL, NEWLINE, CARRIAGE RETURN, SEMICOLON, COLON, SLASH, TAB, SPACE, COMMA, or ()[]{} |
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54 ## i.e. ASCII 0,9,10,11,12,13,14,32,33,34,40,41,44,47,58,59,91,93,123,124,125 |
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55 ## |
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56 ## Examples: |
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57 ## str2double('-.1e-5') |
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58 ## ans = -1.0000e-006 |
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59 ## |
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60 ## str2double('.314e1, 44.44e-1, .7; -1e+1') |
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61 ## ans = |
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62 ## 3.1400 4.4440 0.7000 |
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63 ## -10.0000 NaN NaN |
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64 ## |
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65 ## line ='200,300,400,NaN,-inf,cd,yes,no,999,maybe,NaN'; |
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66 ## [x,status]=str2double(line) |
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67 ## x = |
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68 ## 200 300 400 NaN -Inf NaN NaN NaN 999 NaN NaN |
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69 ## status = |
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70 ## 0 0 0 0 0 -1 -1 -1 0 -1 0 |
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71 ## |
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72 ## Reference(s): |
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73 ## [1] David A. Wheeler, Secure Programming for Linux and Unix HOWTO. |
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74 ## http://en.tldp.org/HOWTO/Secure-Programs-HOWTO/ |
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75 |
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76 function [num, status, strarray] = str2double (s, cdelim, rdelim, ddelim) |
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77 |
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78 FLAG_OCTAVE = exist('OCTAVE_VERSION','builtin'); |
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79 |
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80 ## digits, sign, exponent,NaN,Inf |
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81 ## valid_char = '0123456789eE+-.nNaAiIfF'; |
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82 |
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83 ## valid delimiters |
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84 valid_delim = char (sort ([0, 9:14, 32:34, abs("()[]{},;:\"|/")])); |
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85 |
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86 if (nargin < 1) |
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87 error ("missing input argument"); |
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88 endif |
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89 |
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90 if (nargin < 2) |
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91 ## column delimiter |
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92 cdelim = char ([9, 32, abs(",")]); |
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93 else |
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94 ## make unique cdelim |
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95 cdelim = char (sort (cdelim(:))); |
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96 tmp = [1; 1+find(diff(abs(cdelim))>0)]; |
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97 cdelim = cdelim(tmp)'; |
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98 endif |
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99 |
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100 if (nargin < 3) |
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101 ## row delimiter |
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102 rdelim = char ([0, 10, 13, abs(";")]); |
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103 else |
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104 ## make unique rdelim |
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105 rdelim = char (sort (rdelim(:))); |
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106 tmp = [1; 1+find(diff(abs(rdelim))>0)]; |
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107 rdelim = rdelim(tmp)'; |
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108 endif |
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109 |
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110 if (nargin < 4) |
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111 ddelim = '.'; |
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112 elseif (length (ddelim) != 1) |
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113 error ("decimal delimiter must be exactly one character"); |
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114 endif |
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115 |
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116 ## check if RDELIM and CDELIM are distinct |
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117 |
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118 delim = sort (abs ([cdelim, rdelim, ddelim])); |
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119 tmp = [1, 1+find(diff(delim)>0)]; |
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120 delim = delim(tmp); |
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121 ## [length(delim),length(cdelim),length(rdelim)] |
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122 if (length (delim) < (length(cdelim) + length(rdelim))+1) |
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123 ## length (ddelim) must be one. |
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124 error ("row, column and decimal delimiter are not distinct"); |
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125 endif |
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126 |
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127 ## check if delimiters are valid |
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128 tmp = sort (abs ([cdelim, rdelim])); |
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129 flag = zeros (size (tmp)); |
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130 k1 = 1; |
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131 k2 = 1; |
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132 while (k1 <= length (tmp) && k2 <= length (valid_delim)), |
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133 if (tmp(k1) == valid_delim(k2)) |
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134 flag(k1) = 1; |
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135 k1++; |
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136 elseif (tmp(k1) < valid_delim(k2)) |
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137 k1++; |
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138 elseif (tmp(k1) > valid_delim(k2)) |
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139 k2++; |
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140 endif |
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141 endwhile |
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142 if (! all (flag)) |
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143 error ("invalid delimiters!"); |
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144 endif |
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145 |
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146 ## various input parameters |
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147 |
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148 if (isnumeric (s)) |
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149 if (all (s < 256) && all (s >= 0)) |
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150 s = char (s); |
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151 else |
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152 error ("str2double: input variable must be a string"); |
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153 endif |
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154 endif |
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155 |
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156 if (isempty (s)) |
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157 num = []; |
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158 status = 0; |
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159 return; |
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160 elseif (iscell (s)) |
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161 strarray = s; |
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162 elseif (ischar (s) && all (size (s) > 1)) |
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163 ## char array transformed into a string. |
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164 for k = 1:size (s, 1) |
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165 tmp = find (! isspace (s(k,:))); |
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166 strarray{k,1} = s(k,min(tmp):max(tmp)); |
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167 endfor |
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168 elseif (ischar (s)), |
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169 num = []; |
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170 status = 0; |
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171 strarray = {}; |
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172 ## add stop sign; makes sure last digit is not skipped |
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173 s(end+1) = rdelim(1); |
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174 RD = zeros (size (s)); |
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175 for k = 1:length (rdelim), |
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176 RD = RD | (s == rdelim(k)); |
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177 endfor |
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178 CD = RD; |
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179 for k = 1:length (cdelim), |
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180 CD = CD | (s==cdelim(k)); |
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181 endfor |
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182 |
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183 k1 = 1; # current row |
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184 k2 = 0; # current column |
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185 k3 = 0; # current element |
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186 |
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187 sl = length (s); |
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188 ix = 1; |
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189 ## while (ix < sl) & any(abs(s(ix))==[rdelim,cdelim]), |
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190 while (ix < sl && CD(ix)) |
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191 ix++ |
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192 endwhile |
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193 ta = ix; |
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194 te = []; |
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195 while (ix <= sl) |
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196 if (ix == sl) |
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197 te = sl; |
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198 endif |
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199 ## if any(abs(s(ix))==[cdelim(1),rdelim(1)]), |
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200 if (CD(ix)) |
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201 te = ix - 1; |
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202 endif |
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203 if (! isempty (te)) |
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204 k2++; |
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205 k3++; |
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206 strarray{k1,k2} = s(ta:te); |
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207 ## strarray{k1,k2} = [ta,te]; |
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208 |
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209 flag = 0; |
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210 ## while any(abs(s(ix))==[cdelim(1),rdelim(1)]) & (ix < sl), |
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211 while (CD(ix) && ix < sl) |
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212 flag = flag | RD(ix); |
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213 ix++; |
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214 endwhile |
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215 |
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216 if (flag) |
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217 k2 = 0; |
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218 k1++; |
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219 endif |
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220 ta = ix; |
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221 te = []; |
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222 endif |
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223 ix++; |
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224 endwhile |
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225 else |
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226 error ("str2double: invalid input argument"); |
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227 endif |
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228 |
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229 [nr, nc]= size (strarray); |
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230 status = zeros (nr, nc); |
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231 num = repmat (NaN, nr, nc); |
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232 |
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233 for k1 = 1:nr |
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234 for k2 = 1:nc |
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235 t = strarray{k1,k2}; |
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236 if (length (t) == 0) |
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237 ## return error code |
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238 status(k1,k2) = -1; |
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239 num(k1,k2) = NaN; |
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240 else |
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241 ## get mantisse |
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242 g = 0; |
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243 v = 1; |
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244 if (t(1) == "-") |
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245 v = -1; |
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246 l = min (2, length(t)); |
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247 elseif (t(1) == "+") |
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248 l = min (2, length (t)); |
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249 else |
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250 l = 1; |
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251 endif |
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252 |
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253 if (strcmpi (t(l:end), "inf")) |
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254 num(k1,k2) = v*Inf; |
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255 elseif (strcmpi (t(l:end), "NaN")); |
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256 num(k1,k2) = NaN; |
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257 else |
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258 if (ddelim == ".") |
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259 t(t==ddelim) = "."; |
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260 endif |
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261 [v,tmp2,c] = sscanf(char(t), "%f %s", "C"); |
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262 ## [v,c,em,ni] = sscanf(char(t),"%f %s"); |
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263 ## c = c * (ni>length(t)); |
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264 if (c == 1), |
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265 num(k1,k2) = v; |
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266 else |
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267 num(k1,k2) = NaN; |
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268 status(k1,k2) = -1; |
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269 endif |
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270 endif |
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271 endif |
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272 endfor |
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273 endfor |
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274 |
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275 endfunction |
