/usr/include/blitz/array/convolve.cc is in libblitz0-dev 1:0.10-3.3.
This file is owned by root:root, with mode 0o644.
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* blitz/array/convolve.cc One-dimensional convolution
*
* $Id$
*
* Copyright (C) 1997-2011 Todd Veldhuizen <tveldhui@acm.org>
*
* This file is a part of Blitz.
*
* Blitz is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Blitz is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Blitz. If not, see <http://www.gnu.org/licenses/>.
*
* Suggestions: blitz-devel@lists.sourceforge.net
* Bugs: blitz-support@lists.sourceforge.net
*
* For more information, please see the Blitz++ Home Page:
* https://sourceforge.net/projects/blitz/
*
****************************************************************************/
#ifndef BZ_ARRAY_CONVOLVE_CC
#define BZ_ARRAY_CONVOLVE_CC
BZ_NAMESPACE(blitz)
template<typename T>
Array<T,1> convolve(const Array<T,1>& B, const Array<T,1>& C)
{
int Bl = B.lbound(0), Bh = B.ubound(0);
int Cl = C.lbound(0), Ch = C.ubound(0);
int lbound = Bl + Cl;
int ubound = Bh + Ch;
Array<T,1> A(Range(lbound,ubound));
T result;
for (int i=lbound; i <= ubound; ++i)
{
int jl = i - Ch;
if (jl < Bl)
jl = Bl;
int jh = i - Cl;
if (jh > Bh)
jh = Bh;
result = 0;
for (int j=jl; j <= jh; ++j)
result += B(j) * C(i-j);
A(i) = result;
}
return A;
}
BZ_NAMESPACE_END
#endif // BZ_ARRAY_CONVOLVE_CC
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