8bb54b04ef
FYI: find ortools \( -type d -name .git -prune \) -o -type f -print0 | xargs -0 sed -i 's/\(Copyright 2010\)-2018/\1-2021/g'
76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
// Copyright 2010-2021 Google LLC
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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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#include "ortools/lp_data/sparse_column.h"
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#include <algorithm>
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#include "ortools/lp_data/lp_types.h"
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namespace operations_research {
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namespace glop {
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// --------------------------------------------------------
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// RandomAccessSparseColumn
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// --------------------------------------------------------
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RandomAccessSparseColumn::RandomAccessSparseColumn(RowIndex num_rows)
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: column_(num_rows, 0.0), changed_(num_rows, false), row_change_() {}
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RandomAccessSparseColumn::~RandomAccessSparseColumn() {}
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void RandomAccessSparseColumn::Clear() {
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const size_t num_changes = row_change_.size();
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for (int i = 0; i < num_changes; ++i) {
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const RowIndex row = row_change_[i];
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column_[row] = Fractional(0.0);
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changed_[row] = false;
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}
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row_change_.clear();
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}
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void RandomAccessSparseColumn::Resize(RowIndex num_rows) {
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if (num_rows <= column_.size()) {
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return;
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}
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column_.resize(num_rows, 0.0);
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changed_.resize(num_rows, false);
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}
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void RandomAccessSparseColumn::PopulateFromSparseColumn(
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const SparseColumn& sparse_column) {
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Clear();
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for (const SparseColumn::Entry e : sparse_column) {
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SetCoefficient(e.row(), e.coefficient());
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}
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}
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void RandomAccessSparseColumn::PopulateSparseColumn(
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SparseColumn* sparse_column) const {
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RETURN_IF_NULL(sparse_column);
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sparse_column->Clear();
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const size_t num_changes = row_change_.size();
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for (int change_id = 0; change_id < num_changes; ++change_id) {
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const RowIndex row = row_change_[change_id];
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const Fractional value = column_[row];
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// TODO(user): Do that only if (value != 0.0) ?
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sparse_column->SetCoefficient(row, value);
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}
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DCHECK(sparse_column->CheckNoDuplicates());
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}
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} // namespace glop
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} // namespace operations_research
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