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eigen/doc/snippets/PartialPivLU_solve.cpp
2026-05-04 00:36:12 +00:00

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// SPDX-FileCopyrightText: The Eigen Authors
// SPDX-License-Identifier: MPL-2.0
MatrixXd A = MatrixXd::Random(3, 3);
MatrixXd B = MatrixXd::Random(3, 2);
cout << "Here is the invertible matrix A:" << endl << A << endl;
cout << "Here is the matrix B:" << endl << B << endl;
MatrixXd X = A.lu().solve(B);
cout << "Here is the (unique) solution X to the equation AX=B:" << endl << X << endl;
cout << "Relative error: " << (A * X - B).norm() / B.norm() << endl;