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1 ## Copyright (C) 2002 Rolf Fabian <fabian@tu-cottbus.de> |
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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {@var{s} =} mat2str (@var{x}, @var{n}) |
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22 ## @deftypefnx {Function File} {@var{s} =} mat2str (@dots{}, 'class') |
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23 ## |
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24 ## Format real/complex numerical matrices as strings. This function |
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25 ## returns values that are suitable for the use of the @code{eval} |
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26 ## function. |
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27 ## |
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28 ## The precision of the values is given by @var{n}. If @var{n} is a |
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29 ## scalar then both real and imaginary parts of the matrix are printed |
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30 ## to the same precision. Otherwise @code{@var{n} (1)} defines the |
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31 ## precision of the real part and @code{@var{n} (2)} defines the |
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32 ## precision of the imaginary part. The default for @var{n} is 17. |
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33 ## |
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34 ## If the argument 'class' is given, then the class of @var{x} is |
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35 ## included in the string in such a way that the eval will result in the |
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36 ## construction of a matrix of the same class. |
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37 ## |
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38 ## @example |
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39 ## @group |
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40 ## mat2str( [ -1/3 + i/7; 1/3 - i/7 ], [4 2] ) |
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41 ## @result{} '[-0.3333+0.14i;0.3333-0.14i]' |
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42 ## mat2str( [ -1/3 +i/7; 1/3 -i/7 ], [4 2] ) |
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43 ## @result{} '[-0.3333+0i,0+0.14i;0.3333+0i,-0-0.14i]' |
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44 ## mat2str( int16([1 -1]), 'class') |
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45 ## @result{} 'int16([1,-1])' |
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46 ## @end group |
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47 ## @end example |
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48 ## |
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49 ## @seealso{sprintf, int2str} |
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50 ## @end deftypefn |
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51 |
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52 function s = mat2str (x, n, cls) |
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53 |
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54 if (nargin < 2 || isempty (n)) |
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55 ## Default precision |
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56 n = 17; |
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57 endif |
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58 |
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59 if (nargin < 3) |
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60 if (ischar (n)) |
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61 cls = n; |
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62 n = 17; |
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63 else |
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64 cls = ""; |
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65 endif |
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66 endif |
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67 |
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68 if (nargin < 1 || nargin > 3 || ! isnumeric (x)) |
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69 print_usage (); |
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70 endif |
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71 |
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72 if (ndims (x) > 2) |
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73 error ("mat2str: X must be two dimensional"); |
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74 endif |
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75 |
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76 x_is_complex = is_complex (x); |
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77 |
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78 if (! x_is_complex) |
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79 fmt = sprintf ("%%.%dg", n(1)); |
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80 else |
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81 if (length (n) == 1 ) |
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82 n = [n, n]; |
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83 endif |
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84 fmt = sprintf ("%%.%dg%%+.%dgi", n(1), n(2)); |
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85 endif |
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86 |
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87 nel = numel (x); |
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88 |
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89 if (nel == 0) |
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90 ## Empty, only print brackets |
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91 s = "[]"; |
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92 elseif (nel == 1) |
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93 ## Scalar X, don't print brackets |
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94 if (! x_is_complex) |
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95 s = sprintf (fmt, x); |
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96 else |
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97 s = sprintf (fmt, real (x), imag (x)); |
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98 endif |
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99 else |
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100 ## Non-scalar X, print brackets |
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101 fmt = [fmt, ","]; |
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102 if (! x_is_complex) |
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103 s = sprintf (fmt, x.'); |
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104 else |
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105 x = x.'; |
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106 s = sprintf (fmt, [real(x(:))'; imag(x(:))']); |
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107 endif |
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108 |
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109 s = ["[", s]; |
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110 s(end) = "]"; |
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111 ind = find (s == ","); |
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112 nc = columns (x); |
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113 s(ind(nc:nc:end)) = ";"; |
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114 endif |
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115 |
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116 if (strcmp ("class", cls)) |
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117 s = [class(x), "(", s, ")"] |
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118 endif |
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119 endfunction |
