00001 c Copyright (C) 2010-2012 VZLU Prague, a.s., Czech Republic 00002 c 00003 c Author: Jaroslav Hajek <highegg@gmail.com> 00004 c 00005 c This file is part of Octave. 00006 c 00007 c Octave is free software; you can redistribute it and/or modify 00008 c it under the terms of the GNU General Public License as published by 00009 c the Free Software Foundation; either version 3 of the License, or 00010 c (at your option) any later version. 00011 c 00012 c This program is distributed in the hope that it will be useful, 00013 c but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 c GNU General Public License for more details. 00016 c 00017 c You should have received a copy of the GNU General Public License 00018 c along with this software; see the file COPYING. If not, see 00019 c <http://www.gnu.org/licenses/>. 00020 c 00021 subroutine cconv2o(ma,na,a,mb,nb,b,c) 00022 c purpose: a 2-dimensional outer additive convolution. 00023 c equivalent to the following: 00024 c for i = 1:ma 00025 c for j = 1:na 00026 c c(i:i+mb-1,j:j+mb-1) += a(i,j)*b 00027 c endfor 00028 c endfor 00029 c arguments: 00030 c ma,na (in) dimensions of a 00031 c a (in) 1st matrix 00032 c mb,nb (in) dimensions of b 00033 c b (in) 2nd matrix 00034 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) 00035 c 00036 integer ma,na,mb,nb 00037 complex a(ma,na),b(mb,nb) 00038 complex c(ma+mb-1,na+nb-1) 00039 integer i,j,k 00040 external caxpy 00041 do k = 1,na 00042 do j = 1,nb 00043 do i = 1,mb 00044 call caxpy(ma,b(i,j),a(1,k),1,c(i,j+k-1),1) 00045 end do 00046 end do 00047 end do 00048 end subroutine 00049 00050 subroutine cconv2i(ma,na,a,mb,nb,b,c) 00051 c purpose: a 2-dimensional inner additive convolution. 00052 c equivalent to the following: 00053 c for i = 1:ma-mb+1 00054 c for j = 1:na-nb+1 00055 c c(i,j) = sum (sum (a(i+mb-1:-1:i,j+nb-1:-1:j) .* b)) 00056 c endfor 00057 c endfor 00058 c arguments: 00059 c ma,na (in) dimensions of a 00060 c a (in) 1st matrix 00061 c mb,nb (in) dimensions of b 00062 c b (in) 2nd matrix 00063 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) 00064 c 00065 integer ma,na,mb,nb 00066 complex a(ma,na),b(mb,nb) 00067 complex c(ma-mb+1,na-nb+1) 00068 integer i,j,k 00069 external caxpy 00070 do k = 1,na-nb+1 00071 do j = 1,nb 00072 do i = 1,mb 00073 call caxpy(ma-mb+1,b(i,j),a(mb+1-i,k+nb-j),1,c(1,k),1) 00074 end do 00075 end do 00076 end do 00077 end subroutine
1.7.1
