## Mercurial > hg > octave-max

### view scripts/sparse/sprandn.m @ 15489:481417a57a2d

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improve sign and signbit docs
* mappers.cc (Fsign): Note sign (-0) is 0. Add @seealso for signbit.
(Fsignbit): Add @seealso for sign.

author | John W. Eaton <jwe@octave.org> |
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date | Thu, 04 Oct 2012 10:20:59 -0400 |

parents | 5d3a684236b0 |

children |

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## Copyright (C) 2004-2012 Paul Kienzle ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## ## Original version by Paul Kienzle distributed as free software in the ## public domain. ## -*- texinfo -*- ## @deftypefn {Function File} {} sprandn (@var{m}, @var{n}, @var{d}) ## @deftypefnx {Function File} {} sprandn (@var{s}) ## Generate a random sparse matrix. The size of the matrix will be ## @var{m} by @var{n}, with a density of values given by @var{d}. ## @var{d} should be between 0 and 1. Values will be normally ## distributed with mean of zero and variance 1. ## ## If called with a single matrix argument, a random sparse matrix is ## generated wherever the matrix @var{S} is non-zero. ## @seealso{sprand, sprandsym} ## @end deftypefn ## Author: Paul Kienzle <pkienzle@users.sf.net> function S = sprandn (m, n, d) if (nargin == 1 ) S = __sprand_impl__ (m, @randn); elseif ( nargin == 3) S = __sprand_impl__ (m, n, d, "sprandn", @randn); else print_usage (); endif endfunction %!test %! s = sprandn (4, 10, 0.1); %! assert (size (s), [4, 10]); %! assert (nnz (s) / numel (s), 0.1); %% Test 1-input calling form %!test %! s = sprandn (sparse ([1 2 3], [3 2 3], [2 2 2])); %! [i, j] = find (s); %! assert (sort (i), [1 2 3]'); %! assert (sort (j), [2 3 3]'); %% Test input validation %!error sprandn () %!error sprandn (1, 2) %!error sprandn (1, 2, 3, 4) %!error sprandn (ones (3), 3, 0.5) %!error sprandn (3.5, 3, 0.5) %!error sprandn (0, 3, 0.5) %!error sprandn (3, ones (3), 0.5) %!error sprandn (3, 3.5, 0.5) %!error sprandn (3, 0, 0.5) %!error sprandn (3, 3, -1) %!error sprandn (3, 3, 2)