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view liboctave/cruft/blas-xtra/dconv2.f @ 23219:3ac9f9ecfae5 stable
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author | John W. Eaton <jwe@octave.org> |
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date | Wed, 22 Feb 2017 12:39:29 -0500 |
parents | bac0d6f07a3e |
children | 092078913d54 |
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c Copyright (C) 2010-2017 VZLU Prague, a.s., Czech Republic c c Author: Jaroslav Hajek <highegg@gmail.com> c c This file is part of Octave. c c Octave is free software; you can redistribute it and/or modify c it under the terms of the GNU General Public License as published by c the Free Software Foundation; either version 3 of the License, or c (at your option) any later version. c c This program is distributed in the hope that it will be useful, c but WITHOUT ANY WARRANTY; without even the implied warranty of c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the c GNU General Public License for more details. c c You should have received a copy of the GNU General Public License c along with this software; see the file COPYING. If not, see c <http://www.gnu.org/licenses/>. c subroutine dconv2o(ma,na,a,mb,nb,b,c) c purpose: a 2-dimensional outer additive convolution. c equivalent to the following: c for i = 1:ma c for j = 1:na c c(i:i+mb-1,j:j+mb-1) += a(i,j)*b c endfor c endfor c arguments: c ma,na (in) dimensions of a c a (in) 1st matrix c mb,nb (in) dimensions of b c b (in) 2nd matrix c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) c integer ma,na,mb,nb double precision a(ma,na),b(mb,nb) double precision c(ma+mb-1,na+nb-1) integer i,j,k external daxpy do k = 1,na do j = 1,nb do i = 1,mb call daxpy(ma,b(i,j),a(1,k),1,c(i,j+k-1),1) end do end do end do end subroutine subroutine dconv2i(ma,na,a,mb,nb,b,c) c purpose: a 2-dimensional inner additive convolution. c equivalent to the following: c for i = 1:ma-mb+1 c for j = 1:na-nb+1 c c(i,j) = sum (sum (a(i+mb-1:-1:i,j+nb-1:-1:j) .* b)) c endfor c endfor c arguments: c ma,na (in) dimensions of a c a (in) 1st matrix c mb,nb (in) dimensions of b c b (in) 2nd matrix c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) c integer ma,na,mb,nb double precision a(ma,na),b(mb,nb) double precision c(ma-mb+1,na-nb+1) integer i,j,k external daxpy do k = 1,na-nb+1 do j = 1,nb do i = 1,mb call daxpy(ma-mb+1,b(i,j),a(mb+1-i,k+nb-j),1,c(1,k),1) end do end do end do end subroutine