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1 ## Copyright (C) 1995, 1996, 1997, 1998, 2000, 2002, 2004, 2005, 2006, |
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2 ## 2007 Kurt Hornik |
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3 ## |
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4 ## This file is part of Octave. |
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5 ## |
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6 ## Octave is free software; you can redistribute it and/or modify it |
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7 ## under the terms of the GNU General Public License as published by |
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8 ## the Free Software Foundation; either version 3 of the License, or (at |
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9 ## your option) any later version. |
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10 ## |
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11 ## Octave is distributed in the hope that it will be useful, but |
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 ## General Public License for more details. |
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15 ## |
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16 ## You should have received a copy of the GNU General Public License |
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17 ## along with Octave; see the file COPYING. If not, see |
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18 ## <http://www.gnu.org/licenses/>. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} dmult (@var{a}, @var{b}) |
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22 ## If @var{a} is a vector of length @code{rows (@var{b})}, return |
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23 ## @code{diag (@var{a}) * @var{b}} (but computed much more efficiently). |
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24 ## @end deftypefn |
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25 |
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26 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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27 ## Description: Rescale the rows of a matrix |
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28 |
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29 function M = dmult (a, B) |
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30 |
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31 if (nargin != 2) |
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32 print_usage (); |
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33 endif |
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34 if (! isvector (a)) |
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35 error ("dmult: a must be a vector of length rows (B)"); |
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36 endif |
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37 a = a(:); |
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38 sb = size (B); |
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39 sb(1) = 1; |
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40 M = repmat (a(:), sb) .* B; |
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41 endfunction |
