com.discursive.jccook.math.SolveEquations.java Source code

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Here is the source code for com.discursive.jccook.math.SolveEquations.java

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/* 
 * ========================================================================
 * 
 * Copyright 2005 Tim O'Brien.
 *
 * 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 com.discursive.jccook.math;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.math.linear.RealMatrix;
import org.apache.commons.math.linear.RealMatrixImpl;

public class SolveEquations {

    public static void main(String[] args) {

        double[][] coefficients = { { 3.0, 20.0, 89.0 }, { 4.0, 40.0, 298.0 }, { 7.0, 21.0, 0.42 } };

        double[] values = { 1324, 2999, 2039 };

        RealMatrix matrix = new RealMatrixImpl(coefficients);

        double[] answers = matrix.solve(values);

        System.out.println("Answers: " + ArrayUtils.toString(answers));

        double[][] badCoefficients = { { 1, 1, 1 }, { 1, 1, 1 }, { 1, 1, 1 } };

        double[] badValues = { 0, 1, 3 };

        matrix = new RealMatrixImpl(badCoefficients);

        answers = matrix.solve(badValues);

        System.out.println("Answers: " + ArrayUtils.toString(answers));

    }
}