org.ejml.dense.row.linsol.InvertUsingSolve_ZDRM Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020, Peter Abeles. All Rights Reserved.
 *
 * This file is part of Efficient Java Matrix Library (EJML).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.ejml.dense.row.linsol;

import org.ejml.data.ZMatrixRMaj;
import org.ejml.dense.row.CommonOps_ZDRM;
import org.ejml.interfaces.linsol.LinearSolverDense;

/**
 * A matrix can be easily inverted by solving a system with an identify matrix.  The only
 * disadvantage of this approach is that additional computations are required compared to
 * a specialized solution.
 *
 * @author Peter Abeles
 */
public class InvertUsingSolve_ZDRM {

    public static void invert( LinearSolverDense solver, ZMatrixRMaj A, ZMatrixRMaj A_inv, ZMatrixRMaj storage ) {

        A_inv.reshape(A.numRows, A.numCols);

        CommonOps_ZDRM.setIdentity(storage);

        solver.solve(storage, A_inv);
    }

    public static void invert( LinearSolverDense solver, ZMatrixRMaj A, ZMatrixRMaj A_inv ) {

        A_inv.reshape(A.numRows, A.numCols);

        CommonOps_ZDRM.setIdentity(A_inv);

        solver.solve(A_inv, A_inv);
    }
}