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annotate scripts/sparse/spfun.m @ 13767:2b98014771b4

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fileread.m: Add functional test. * fileread.m: Add functional test.
author Rik <octave@nomad.inbox5.com>
date Thu, 27 Oct 2011 22:17:03 -0700
parents c792872f8942
children 72c96de7a403
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004-2011 David Bateman and Andy Adler
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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 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{y} =} spfun (@var{f}, @var{S})
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21 ## Compute @code{f(@var{S})} for the non-zero values of @var{S}.
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22 ## This results in a sparse matrix with the same structure as
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23 ## @var{S}. The function @var{f} can be passed as a string, a
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24 ## function handle, or an inline function.
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25 ## @seealso{arrayfun, cellfun, structfun}
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26 ## @end deftypefn
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27
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28 function y = spfun (f, S)
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29
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30 if (nargin != 2)
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31 print_usage ();
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32 endif
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33
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34 [i, j, v] = find (S);
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35 [m, n] = size (S);
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36
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37 if (isa (f, "function_handle") || isa (f, "inline function"))
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38 y = sparse (i, j, f(v), m, n);
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39 else
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40 y = sparse(i, j, feval (f, v), m, n);
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41 endif
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42
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43 endfunction
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44
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45 %!assert(spfun('exp',[1,2;3,0]),sparse([exp(1),exp(2);exp(3),0]))
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46 %!assert(spfun('exp',sparse([1,2;3,0])),sparse([exp(1),exp(2);exp(3),0]))
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47 %!assert(spfun(@exp,[1,2;3,0]),sparse([exp(1),exp(2);exp(3),0]))
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48 %!assert(spfun(@exp,sparse([1,2;3,0])),sparse([exp(1),exp(2);exp(3),0]))
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