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