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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 numerial 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 n = 17; # default precision |
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56 endif |
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57 |
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58 if (nargin < 3) |
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59 if (ischar(n)) |
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60 cls = n; |
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61 n = 17; |
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62 else |
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63 cls = ''; |
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64 endif |
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65 endif |
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66 |
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67 if (nargin < 1 || nargin > 3 || ischar(x) || isstruct(x) || |
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68 ischar(n) || isstruct(n) || isstruct(cls)) |
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69 usage ("mat2str"); |
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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 if (!(COMPLEX = is_complex(x))) |
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77 FMT = sprintf("%%.%dg", n(1)); |
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78 else |
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79 if (length(n) == 1 ) |
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80 n = [n, n]; |
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81 endif |
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82 FMT = sprintf("%%.%dg%%+.%dgi", n(1), n(2)); |
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83 endif |
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84 |
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85 [nr, nc] = size(x); |
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86 |
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87 if (nr*nc == 0) # empty .. only print brackets |
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88 s = "[]"; |
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89 elseif (nr*nc == 1) # scalar x .. don't print brackets |
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90 if (!COMPLEX) |
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91 s = sprintf( FMT, x ); |
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92 else |
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93 s = sprintf( FMT, real(x), imag(x) ); |
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94 endif |
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95 else # non-scalar x .. print brackets |
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96 FMT = [FMT, ',']; |
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97 if (!COMPLEX) |
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98 s = sprintf( FMT, x.' ); |
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99 else |
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100 x = x.'; |
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101 s = sprintf( FMT, [ real(x(:))'; imag(x(:))' ] ); |
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102 endif |
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103 |
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104 s = ["[", s]; |
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105 s (length(s)) = "]"; |
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106 IND = find(s == ","); |
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107 s (IND(nc:nc:length(IND)) ) = ";"; |
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108 endif |
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109 |
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110 if (strcmp ("class", cls)) |
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111 s = [class(x), "(", s, ")"] |
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112 endif |
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113 endfunction |
