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compute_reduce.cc
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/**
* @file compute_reduce.cc
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @date Tue Dec 10 16:00:49 2013
*
* @brief This is a compute which reduce to scalar quantities
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* LibMultiScale 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.
*
* LibMultiScale 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 LibMultiScale. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "compute_reduce.hh"
#include "lib_md.hh"
#include "lm_common.hh"
#include "math_tools.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_LIBMULTISCALE__
/* -------------------------------------------------------------------------- */
ComputeReduce::ComputeReduce(const std::string &name) : LMObject(name) {
this->createInput("input");
this->createArrayOutput("reduced");
}
/* -------------------------------------------------------------------------- */
ComputeReduce::~ComputeReduce() {}
/* -------------------------------------------------------------------------- */
template <Operator Op, typename Cont, typename V>
std::enable_if_t<not std::is_arithmetic_v<V>> reduce(Cont &cont,
V &reduced_data) {
MathTools::ReduceOperator<Op, V> ops;
ops.init(reduced_data.rows(), reduced_data.cols());
for (auto &&val : cont.rowwise()) {
ops.account(val);
}
reduced_data = ops.result(cont.getCommGroup());
}
/* -------------------------------------------------------------------------- */
template <typename Cont> void ComputeReduce::build(Cont &cont) {
const UInt Dim = cont.getDim();
Array reduced_data(1, Dim);
auto &array = this->getOutputAsArray();
array.resize(array.rows(), Dim);
switch (op) {
case OP_MAX:
reduce<OP_MAX>(cont, reduced_data);
break;
case OP_MIN:
reduce<OP_MIN>(cont, reduced_data);
break;
case OP_SUM:
reduce<OP_SUM>(cont, reduced_data);
break;
case OP_AVERAGE:
reduce<OP_AVERAGE>(cont, reduced_data);
break;
default:
LM_FATAL("Operator " << op << " not handled");
}
this->clear();
this->getOutputAsArray().push_back(reduced_data);
}
/* -------------------------------------------------------------------------- */
/* LMDESC REDUCE
This computes a reduced version of a set of reals
*/
/* LMEXAMPLE
COMPUTE disp EXTRACT INPUT md FIELD displacement\\
COMPUTE sum REDUCE INPUT disp OPERATOR MAX
*/
inline void ComputeReduce::declareParams() {
ComputeInterface::declareParams();
/* LMKEYWORD OPERATOR
Specify the operator to use for the reduction. \\
At present time the available operations are:
- MIN
- MAX
- SUM
- AVERAGE
*/
this->parseKeyword("OPERATOR", op);
}
/* -------------------------------------------------------------------------- */
DECLARE_COMPUTE_MAKE_CALL(ComputeReduce)
__END_LIBMULTISCALE__

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