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add missing BLAS sources
author Jaroslav Hajek <highegg@gmail.com>
date Fri, 06 Feb 2009 07:30:55 +0100
parents e07e93c04080
children
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1 ## Copyright (C) 2008 VZLU Prague, a.s., Czech Republic
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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{c} =} dmult (@var{a}, @var{b})
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21 ## @deftypefnx {Function File} {@var{c} =} dmult (@var{a}, @var{b}, @var{ind})
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22 ## Scale a matrix by rows or columns, or a multidimensional tensor along
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23 ## a specified dimension.
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24 ## If @var{a} is a vector of length @code{rows (@var{b})}, return
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25 ## @code{diag (@var{a}) * @var{b}} (but computed much more efficiently).
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26 ## Similarly, if @var{b} is a vector of length @code{columns(@var{a})},
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27 ## return @code{@var{a} * diag(@var{b})}.
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28 ##
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29 ## If @var{b} is a multidimensional array and @var{a} a vector,
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30 ## @var{c} will have the same shape as @var{b}, with
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31 ## @code{@var{C}(i,:,@dots{}) = @var{a}(i)*@var{b}(i,:,@dots{})}.
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32 ##
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33 ## If @var{a} is a multidimensional array and @var{b} a vector,
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34 ## @var{c} will have the same shape as @var{a}, with
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35 ## @code{@var{C}(:,@dots{},i) = @var{a}(:,@dots{},i)*@var{b}(i)}.
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36 ##
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37 ## If @var{ind} is supplied, @var{a} should be an array and @var{b}
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38 ## a vector of length @code{size (@var{a},index)}. The result is then
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39 ## @code{@var{C}(:,@dots{},i,:,@dots{}) = @var{a}(:,@dots{},i,:,@dots{})*@var{b}(i)}
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40 ## where i indexes the @var{ind}-th dimension.
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41 ## @end deftypefn
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42
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43 ## Author: Jaroslav Hajek <highegg@gmail.com>
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44 ## Description: Scale a tensor along a dimension
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45
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46 ### Original Author: KH <Kurt.Hornik@wu-wien.ac.at>
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47 ### Original Description: Rescale the rows of a matrix
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48
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49 function m = dmult (a, b, ind)
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50 if (nargin == 2)
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51 sa = size (a);
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52 sb = size (b);
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53 if (isvector (a) && length (a) == sb(1))
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54 a = a(:);
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55 m = reshape (kron (ones (prod (sb(2:end)), 1), a), sb) .* b;
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56 elseif (isvector (b) && length (b) == sa(end))
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57 b = b(:);
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58 m = reshape (kron (b, ones (prod (sa (1:end-1)), 1)), sa) .* a;
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59 else
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60 error ("dmult: dimensions mismatch");
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61 endif
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62
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63 elseif (nargin == 3 && isscalar (ind))
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64 if (isvector (b) && ind > 0 && ind <= ndims (a)
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65 && length (b) == size (a, ind))
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66 b = b(:);
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67 sa = size (a);
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68 sal = prod (sa(1:ind-1)); sat = prod (sa(ind+1:end));
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69 s = kron (ones (sat, 1), kron (b, ones (sal, 1)));
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70 m = reshape (s, sa) .* a;
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71 else
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72 error ("dmult: dimensions mismatch or index out of range");
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73 endif
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74 else
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75 print_usage ();
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76 endif
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77
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78 endfunction
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79
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80 %!test
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81 %! assert (dmult ([1,2,3], ones(3)), [1,1,1;2,2,2;3,3,3])
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82 %! assert (dmult ([1,2,3]', ones(3)), [1,1,1;2,2,2;3,3,3])
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83 %!test
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84 %! assert (dmult ([1,2,3], ones(3,2,2)), reshape ([1,1,1,1;2,2,2,2;3,3,3,3], [3,2,2]))
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85 %!test
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86 %! assert (dmult (ones(3), [1,2,3]), [1,2,3;1,2,3;1,2,3])
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87 %! assert (dmult (ones(3), [1,2,3]'), [1,2,3;1,2,3;1,2,3])
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88 %!test
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89 %! assert (dmult (ones(2,2,3), [1,2,3]), reshape ([1,2,3;1,2,3;1,2,3;1,2,3], [2,2,3]))
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90 %!test
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91 %! assert (dmult (ones(3,4,2), [1 2 3 4], 2),...
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92 %! reshape ([1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4], [3,4,2]))