87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
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// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2015 Google Inc. All rights reserved.
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// http://ceres-solver.org/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: sameeragarwal@google.com (Sameer Agarwal)
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#ifndef CERES_PUBLIC_CRS_MATRIX_H_
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#define CERES_PUBLIC_CRS_MATRIX_H_
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#include <vector>
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#include "ceres/internal/port.h"
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#include "ceres/internal/disable_warnings.h"
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namespace ceres {
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// A compressed row sparse matrix used primarily for communicating the
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// Jacobian matrix to the user.
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struct CERES_EXPORT CRSMatrix {
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CRSMatrix() : num_rows(0), num_cols(0) {}
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int num_rows;
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int num_cols;
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// A compressed row matrix stores its contents in three arrays,
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// rows, cols and values.
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//
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// rows is a num_rows + 1 sized array that points into the cols and
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// values array. For each row i:
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//
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// cols[rows[i]] ... cols[rows[i + 1] - 1] are the indices of the
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// non-zero columns of row i.
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//
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// values[rows[i]] .. values[rows[i + 1] - 1] are the values of the
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// corresponding entries.
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//
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// cols and values contain as many entries as there are non-zeros in
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// the matrix.
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//
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// e.g, consider the 3x4 sparse matrix
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//
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// [ 0 10 0 4 ]
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// [ 0 2 -3 2 ]
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// [ 1 2 0 0 ]
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//
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// The three arrays will be:
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//
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//
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// -row0- ---row1--- -row2-
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// rows = [ 0, 2, 5, 7]
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// cols = [ 1, 3, 1, 2, 3, 0, 1]
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// values = [10, 4, 2, -3, 2, 1, 2]
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std::vector<int> cols;
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std::vector<int> rows;
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std::vector<double> values;
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};
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} // namespace ceres
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#include "ceres/internal/reenable_warnings.h"
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#endif // CERES_PUBLIC_CRS_MATRIX_H_
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