52 lines
2.0 KiB
C++
52 lines
2.0 KiB
C++
// Copyright 2010-2017 Google
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Utility helpers for manipulating LinearProgram and other types defined in
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// lp_data.
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#ifndef OR_TOOLS_LP_DATA_LP_DATA_UTILS_H_
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#define OR_TOOLS_LP_DATA_LP_DATA_UTILS_H_
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#include "ortools/glop/parameters.pb.h"
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#include "ortools/lp_data/lp_data.h"
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#include "ortools/lp_data/lp_types.h"
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#include "ortools/lp_data/matrix_scaler.h"
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namespace operations_research {
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namespace glop {
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// For all constraints in linear_program, if the constraint has a slack
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// variable, change its value in *values so that the constraints itself is
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// satisfied.
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// Note that this obviously won't always imply that the bounds of the slack
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// variable itself will be satisfied.
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// The code assumes (and DCHECKs) that all constraints with a slack variable
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// have their upper and lower bounds both set to 0. This is ensured by
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// LinearProgram::AddSlackVariablesWhereNecessary().
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void ComputeSlackVariablesValues(const LinearProgram& linear_program,
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DenseRow* values);
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// This is separated from LinearProgram class because of a cyclic dependency
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// when scaling as an LP.
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void Scale(LinearProgram* lp, SparseMatrixScaler* scaler,
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GlopParameters::ScalingAlgorithm scaling_method);
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// A convenience method for above providing a default algorithm for callers that
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// don't specify one.
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void Scale(LinearProgram* lp, SparseMatrixScaler* scaler);
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} // namespace glop
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} // namespace operations_research
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#endif // OR_TOOLS_LP_DATA_LP_DATA_UTILS_H_
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