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library
LibUtilities
BasicUtils
VDmath.hpp
Go to the documentation of this file.
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///////////////////////////////////////////////////////////////////////////////
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//
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// File DVmath.hpp
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//
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// For more information, please see: http://www.nektar.info
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//
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// The MIT License
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//
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// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
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// Department of Aeronautics, Imperial College London (UK), and Scientific
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// Computing and Imaging Institute, University of Utah (USA).
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//
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// License for the specific language governing rights and limitations under
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// Description: Collection of templated functions for distributed vector
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// mathematics
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//
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///////////////////////////////////////////////////////////////////////////////
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#ifndef NEKTAR_LIB_LIBUTILITIES_BASSICUTILS_VECTORDISTMATH_HPP
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#define NEKTAR_LIB_LIBUTILITIES_BASSICUTILS_VECTORDISTMATH_HPP
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#include <
LibUtilities/Communication/Comm.h
>
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namespace
VDmath
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{
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/// \brief vvtvp (vector times vector times vector): z = w*x*y
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template
<
class
T> T
Ddot2
(
Nektar::LibUtilities::CommSharedPtr
& pComm,
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int
n,
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const
T *w,
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const
T *x,
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const
int
*y)
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{
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T sum = 0;
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while
( n-- )
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{
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sum += (*y == 1 ? (*w) * (*x) : 0 );
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++w;
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++x;
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++y;
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}
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pComm->AllReduce(sum,
Nektar::LibUtilities::ReduceSum
);
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return
sum;
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}
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/// \brief vvtvp (vector times vector times vector): z = w*x*y
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template
<
class
T> T
Ddot2
(
Nektar::LibUtilities::CommSharedPtr
& pComm,
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int
n,
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const
T *w,
const
int
incw,
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const
T *x,
const
int
incx,
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const
int
*y,
const
int
incy)
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{
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T sum = 0;
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while
( n-- )
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{
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sum += (*y == 1 ? (*w) * (*x) : 0.0 );
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w += incw;
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x += incx;
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y += incy;
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}
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pComm->AllReduce(sum,
Nektar::LibUtilities::ReduceSum
);
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return
sum;
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}
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}
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#endif
/* DVMATH_HPP_ */
Nektar::LibUtilities::ReduceSum
Definition:
Comm.h:69
VDmath
Definition:
VDmath.hpp:42
Nektar::LibUtilities::CommSharedPtr
boost::shared_ptr< Comm > CommSharedPtr
Pointer to a Communicator object.
Definition:
Comm.h:55
Comm.h
VDmath::Ddot2
T Ddot2(Nektar::LibUtilities::CommSharedPtr &pComm, int n, const T *w, const T *x, const int *y)
vvtvp (vector times vector times vector): z = w*x*y
Definition:
VDmath.hpp:45
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