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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{x} =} spconvert (@var{m}) |
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20 ## This function converts for a simple sparse matrix format easily |
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21 ## produced by other programs into Octave's internal sparse format. The |
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22 ## input @var{x} is either a 3 or 4 column real matrix, containing |
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23 ## the row, column, real and imaginary parts of the elements of the |
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24 ## sparse matrix. An element with a zero real and imaginay part can |
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25 ## be used to force a particular matrix size. |
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26 ## @end deftypefn |
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27 |
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28 function s = spconvert (m) |
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29 |
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30 if issparse(m) |
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31 s = m; |
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32 else |
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33 sz = size(m); |
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34 if (nargin != 1 || !ismatrix(m) || !isreal(m) || length(sz) != 2 || |
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35 (sz(2) != 3 && sz(2) != 4)) |
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36 error ("spconvert: input matrix must be either sparse or a three or four column"); |
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37 error (" real matrix"); |
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38 elseif (sz(2) == 3) |
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39 s = sparse (m(:,1), m(:,2), m(:,3)); |
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40 else |
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41 s = sparse (m(:,1), m(:,2), m(:,3) + 1i*m(:,4)); |
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42 endif |
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43 endif |
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44 endfunction |
