Jama 包，4x4 线性方程求解器

Question

我正在尝试使用 Jama 求解 4x4 线性方程组（4 个变量，4 个方程）。我尝试了以下代码，但它不起作用。如果有人可以使用 Jama 或任何其他方法帮助我，我将不胜感激。

import Jama.Matrix;

public class OvaWork {

    public OvaWork() 
    {

        //Creating  Arrays Representing Equations
        double[][] lhsArray = {{-3, 1, -1}, {5, -2, 1}, {-1, 1, 3}, {2, 5, 7}};
        double[] rhsArray = {-4, 6, 0, 8};
        //Creating Matrix Objects with arrays
        Matrix lhs = new Matrix(lhsArray);
        Matrix rhs = new Matrix(rhsArray, 4);
        //Calculate Solved Matrix
        Matrix ans = lhs.solve(rhs);
        //Printing Answers
        System.out.println("w = " + Math.round(ans.get(0, 0)));
        System.out.println("x = " + Math.round(ans.get(1, 0)));
        System.out.println("y = " + Math.round(ans.get(2, 0)));
        System.out.println("z = " + Math.round(ans.get(3, 0)));
    }

    public static void main(String[] args) 
    {
        OvaWork o = new OvaWork();
    }
}

Answer 1

你必须尝试更简单的例子，比如这个 2x2 方程

double[][] lhsArray = {{1,1},{2, 0}};
double[] rhsArray = {10,2};
Matrix lhs = new Matrix(lhsArray);
Matrix rhs = new Matrix(rhsArray, 2);
Matrix ans = lhs.solve(rhs);

有效，输出为矩阵 {1,9}

您的代码存在问题，您的矩阵不是正方形，而是 3x4

double[][] lhsArray = {{-3, 1, -1}, {5, -2, 1}, {-1, 1, 3}, {2, 5, 7}};

将矩阵更改为正方形。

测试这个简单的等式：

double[][] lhsArray = {{1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}};
double[] rhsArray = {1, 2, 3, 4};
Matrix lhs = new Matrix(lhsArray);
Matrix rhs = new Matrix(rhsArray, 4);
Matrix ans = lhs.solve(rhs);

答案是预期的 {1,2,3,4}。

Jama 包，4x4 线性方程求解器

Jama package, 4x4 linear equation solver

java

matrix

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