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liboctave
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blas-xtra
zdotc3.f
Go to the documentation of this file.
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c Copyright (C) 2009-2015 VZLU Prague, a.s., Czech Republic
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c
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c Author: Jaroslav Hajek <
[email protected]
>
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c
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c This file is part of Octave.
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c
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c Octave is free software; you can redistribute it and/or modify
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c it under the terms of the GNU General Public License as published by
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c the Free Software Foundation; either version 3 of the License, or
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c (at your option) any later version.
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c
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c This program is distributed in the hope that it will be useful,
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c but WITHOUT ANY WARRANTY; without even the implied warranty of
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c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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c GNU General Public License for more details.
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c
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c You should have received a copy of the GNU General Public License
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c along with this software; see the file COPYING. If not, see
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c <http://www.gnu.org/licenses/>.
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c
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subroutine
zdotc3
(m,n,k,a,b,c)
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c purpose: a 3-dimensional dot product.
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c c = sum (conj (a) .* b, 2), where a and b are 3d arrays.
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c arguments:
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c m,n,k (in) the dimensions of a and b
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c a,b (in) double complex input arrays of size (m,k,n)
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c c (out) double complex output array, size (m,n)
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integer
m,n,k,i,j,l
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double complex
a(m,k,n),b(m,k,n)
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double complex
c(m,n)
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double complex
zdotc
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external
zdotc
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c quick return if possible.
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if
(m <= 0 .or. n <= 0)
return
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if
(m == 1)
then
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c the column-major case.
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do
j = 1,n
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c(1,j) = zdotc(k,a(1,1,j),1,b(1,1,j),1)
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end do
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else
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c We prefer performance here, because that's what we generally
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c do by default in reduction functions. Besides, the accuracy
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c of xDOT is questionable. Hence, do a cache-aligned nested loop.
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do
j = 1,n
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do
i = 1,m
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c(i,j) = 0d0
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end do
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do
l = 1,k
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do
i = 1,m
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c(i,j) = c(i,j) + conjg(a(i,l,j))*b(i,l,j)
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end do
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end do
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end do
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end if
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end subroutine
zdotc3
subroutine zdotc3(m, n, k, a, b, c)
Definition:
zdotc3.f:21
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