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1 ## Copyright (C) 2001 Paul Kienzle |
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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16 |
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17 ## v = nansum (X [, dim]); |
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18 ## nansum is identical to the sum function except that NaN values are |
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19 ## treated as 0 and so ignored. If all values are NaN, the sum is |
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20 ## returned as 0. [Is this behaviour compatible?] |
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21 ## |
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22 ## See also: nanmin, nanmax, nanmean, nanmedian |
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23 function v = nansum (X, ...) |
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24 if nargin < 1 |
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25 usage ("v = nansum (X [, dim])"); |
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26 else |
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27 dfi = do_fortran_indexing; |
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28 pzoi = prefer_zero_one_indexing; |
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29 unwind_protect |
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30 do_fortran_indexing = 1; |
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31 prefer_zero_one_indexing = 1; |
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32 |
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33 X(isnan(X)) = 0; |
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34 v = sum (X, all_va_args); |
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35 unwind_protect_cleanup |
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36 do_fortran_indexing = dfi; |
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37 prefer_zero_one_indexing = pzoi; |
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38 end_unwind_protect |
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39 endif |
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40 endfunction |
