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A high-level interpreted language, primarily intended for numerical computations, mostly compatible with Matlab
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csconv2.f
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1 c Copyright (C) 2010-2013 VZLU Prague, a.s., Czech Republic
2 c
3 c Author: Jaroslav Hajek <[email protected]>
4 c
5 c This file is part of Octave.
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15 c GNU General Public License for more details.
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20 c
21  subroutine csconv2o(ma,na,a,mb,nb,b,c)
22 c purpose: a 2-dimensional outer additive convolution.
23 c equivalent to the following:
24 c for i = 1:ma
25 c for j = 1:na
26 c c(i:i+mb-1,j:j+mb-1) += a(i,j)*b
27 c endfor
28 c endfor
29 c arguments:
30 c ma,na (in) dimensions of a
31 c a (in) 1st matrix
32 c mb,nb (in) dimensions of b
33 c b (in) 2nd matrix
34 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1)
35 c
36  integer ma,na,mb,nb
37  complex a(ma,na)
38  real b(mb,nb)
39  complex c(ma+mb-1,na+nb-1)
40  complex btmp
41  integer i,j,k
42  external caxpy
43  do k = 1,na
44  do j = 1,nb
45  do i = 1,mb
46  btmp = b(i,j)
47  call caxpy(ma,btmp,a(1,k),1,c(i,j+k-1),1)
48  end do
49  end do
50  end do
51  end subroutine
52 
53  subroutine csconv2i(ma,na,a,mb,nb,b,c)
54 c purpose: a 2-dimensional inner additive convolution.
55 c equivalent to the following:
56 c for i = 1:ma-mb+1
57 c for j = 1:na-nb+1
58 c c(i,j) = sum (sum (a(i:i+mb-1,j:j+nb-1) .* b))
59 c endfor
60 c endfor
61 c arguments:
62 c ma,na (in) dimensions of a
63 c a (in) 1st matrix
64 c mb,nb (in) dimensions of b
65 c b (in) 2nd matrix
66 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1)
67 c
68  integer ma,na,mb,nb
69  complex a(ma,na)
70  real b(mb,nb)
71  complex c(ma-mb+1,na-nb+1)
72  complex btmp
73  integer i,j,k
74  external caxpy
75  do k = 1,na-nb+1
76  do j = 1,nb
77  do i = 1,mb
78  btmp = b(i,j)
79  call caxpy(ma-mb+1,btmp,a(mb+1-i,k+nb-j),1,c(1,k),1)
80  end do
81  end do
82  end do
83  end subroutine