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annotate scripts/sparse/sprand.m @ 20737:2d9ec16fa960

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Print error, rather than aborting, if mex function mxIsFromGlobalWS is used (bug #46070). * mex.cc (mxIsFromGlobalWS): Call mexErrMsgTxt rather than abort() in function.
author Rik <rik@octave.org>
date Tue, 29 Sep 2015 12:00:11 -0700
parents 26bd6008fc9c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2004-2015 Paul Kienzle
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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 3 of the License, or (at
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18 ##
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19 ## Original version by Paul Kienzle distributed as free software in the
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20 ## public domain.
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21
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22 ## -*- texinfo -*-
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23 ## @deftypefn {Function File} {} sprand (@var{m}, @var{n}, @var{d})
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24 ## @deftypefnx {Function File} {} sprand (@var{m}, @var{n}, @var{d}, @var{rc})
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25 ## @deftypefnx {Function File} {} sprand (@var{s})
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26 ## Generate a sparse matrix with uniformly distributed random values.
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27 ##
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28 ## The size of the matrix is @var{m}x@var{n} with a density of values @var{d}.
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29 ## @var{d} must be between 0 and 1. Values will be uniformly distributed on
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30 ## the interval (0, 1).
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31 ##
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32 ## If called with a single matrix argument, a sparse matrix is generated with
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33 ## random values wherever the matrix @var{s} is nonzero.
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34 ##
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35 ## If called with a scalar fourth argument @var{rc}, a random sparse matrix
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36 ## with reciprocal condition number @var{rc} is generated. If @var{rc} is
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37 ## a vector, then it specifies the first singular values of the generated
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38 ## matrix (@code{length (@var{rc}) <= min (@var{m}, @var{n})}).
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39 ##
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40 ## @seealso{sprandn, sprandsym, rand}
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41 ## @end deftypefn
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42
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43 ## Author: Paul Kienzle <pkienzle@users.sf.net>
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44 ##
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45 ## Changelog:
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46 ##
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47 ## Piotr Krzyzanowski <przykry2004@users.sf.net>
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48 ## 2004-09-27 use Paul's hint to allow larger random matrices
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49 ## at the price of sometimes lower density than desired
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50 ## David Bateman
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51 ## 2004-10-20 Texinfo help and copyright message
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52
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53 function s = sprand (m, n, d, rc)
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54
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55 if (nargin == 1 )
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56 s = __sprand__ (m, @rand);
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57 elseif ( nargin == 3)
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58 s = __sprand__ (m, n, d, "sprand", @rand);
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59 elseif (nargin == 4)
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60 s = __sprand__ (m, n, d, rc, "sprand", @rand);
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61 else
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62 print_usage ();
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63 endif
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64
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65 endfunction
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66
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67
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68 ## Test 3-input calling form
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69 %!test
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70 %! s = sprand (4, 10, 0.1);
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71 %! assert (size (s), [4, 10]);
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72 %! assert (nnz (s) / numel (s), 0.1);
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74 ## Test 4-input calling form
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75 %!test
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76 %! d = rand ();
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77 %! s1 = sprand (100, 100, d, 0.4);
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78 %! rc = [5, 4, 3, 2, 1, 0.1];
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79 %! s2 = sprand (100, 100, d, rc);
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80 %! s3 = sprand (6, 4, d, rc);
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81 %! assert (svd (s2)'(1:length (rc)), rc, sqrt (eps));
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82 %! assert (1/cond (s1), 0.4, sqrt (eps));
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83 %! assert (nnz (s1) / (100*100), d, 0.02);
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84 %! assert (nnz (s2) / (100*100), d, 0.02);
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85 %! assert (svd (s3)', [5 4 3 2], sqrt (eps));
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86
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87 ## Test 1-input calling form
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88 %!test
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89 %! s = sprand (sparse ([1 2 3], [3 2 3], [2 2 2]));
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90 %! [i, j, v] = find (s);
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91 %! assert (sort (i), [1 2 3]');
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92 %! assert (sort (j), [2 3 3]');
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93 %! assert (all (v > 0 & v < 1));
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94
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95 ## Test very large, very low density matrix doesn't fail
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96 %!test
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97 %! s = sprand (1e6, 1e6, 1e-7);
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98
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99 ## Test input validation
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100 %!error sprand ()
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101 %!error sprand (1, 2)
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102 %!error sprand (1, 2, 3, 4)
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103 %!error <M must be an integer greater than 0> sprand (ones (3), 3, 0.5)
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104 %!error <M must be an integer greater than 0> sprand (3.5, 3, 0.5)
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105 %!error <M must be an integer greater than 0> sprand (0, 3, 0.5)
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106 %!error <N must be an integer greater than 0> sprand (3, ones (3), 0.5)
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107 %!error <N must be an integer greater than 0> sprand (3, 3.5, 0.5)
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108 %!error <N must be an integer greater than 0> sprand (3, 0, 0.5)
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109 %!error <D must be between 0 and 1> sprand (3, 3, -1)
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110 %!error <D must be between 0 and 1> sprand (3, 3, 2)
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111 %!error <RC must be a scalar or vector> sprand (2, 2, 0.2, ones (3,3))
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112 %!error <RC must be between 0 and 1> sprand (2, 2, 0.2, -1)
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113 %!error <RC must be between 0 and 1> sprand (2, 2, 0.2, 2)
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114