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1 ## Copyright (C) 2004 David Bateman & Andy Adler |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, write to the Free Software |
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15 ## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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16 ## 02110-1301 USA |
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17 |
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18 ## -*- texinfo -*- |
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19 ## @deftypefn {Function File} {@var{y} =} spfun (@var{f},@var{x}) |
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20 ## Compute @code{f(@var{x})} for the non-zero values of @var{x}. |
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21 ## This results in a sparse matrix with the same structure as |
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22 ## @var{x}. The function @var{f} can be passed as a string, a |
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23 ## function handle or an inline function. |
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24 ## @end deftypefn |
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25 |
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26 function t = spfun(f,s) |
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27 if (nargin != 2) |
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28 usage ("spfun(f,s)") |
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29 endif |
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30 |
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31 if issparse(s) |
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32 [i,j,v,m,n] = spfind(s); |
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33 else |
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34 [i,j,v] = find(s); |
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35 [m,n] = size(s); |
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36 end |
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37 |
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38 if (isa (f, "function handle") || isa (f, "inline function")) |
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39 t = sparse(i,j,f(v),m,n); |
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40 else |
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41 t = sparse(i,j,feval(f,v),m,n); |
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42 endif |
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43 |
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44 endfunction |
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45 |
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46 %!assert(spfun('exp',[1,2;3,0]),sparse([exp(1),exp(2);exp(3),0])) |
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47 %!assert(spfun('exp',sparse([1,2;3,0])),sparse([exp(1),exp(2);exp(3),0])) |
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48 %!assert(spfun(@exp,[1,2;3,0]),sparse([exp(1),exp(2);exp(3),0])) |
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49 %!assert(spfun(@exp,sparse([1,2;3,0])),sparse([exp(1),exp(2);exp(3),0])) |
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50 |
