行列式算法(java)

类别:Java 点击:0 评论:0 推荐:

public class Arranger {
 private double[][] arrangerMatrix;
 private double arrangerResult=1.0;
    public static void main(String args[]){
       double[][] a={{4,1,4,8},{1,1,3,2},{2,2,5,1},{2,2,1,4}};
  
       Arranger ar=new Arranger();
       ar.arrFunction(a);//把行列式变成上三角行列式
       ar.displayMatrix();//显示得出的上三角行列式
       ar.displayResult();  //显示行列式计算结果   
 }
    public void arrFunction(double[][] a){//Guass 消去
       double k=0;
       for (int p = 0; p<a[0].length-1; p++) {  
        for (int r =p+1; r<a.length; r++) {
         k=a[r][p]/a[p][p];
         a[r][p]=0;
         for (int c = p+1; c<a[0].length; c++) {
          a[r][c]=a[r][c]-k*a[p][c];
      }//u
     }//r
    }//c
    arrangerMatrix=new double[a.length][a[0].length];
    for (int i = 0; i<a.length; i++) {
     for (int j = 0; j<a[0].length; j++) {
      arrangerMatrix[i][j]=a[i][j];
      if (i==j) {arrangerResult=arrangerResult*a[i][j];}//计算主对角线相乘的结果
      //System.out.println (a[i][j]+" ");
     }//j
    }//i
    }
    public void displayMatrix(){
     for (int i = 0; i<arrangerMatrix.length; i++) {
     for (int j = 0; j<arrangerMatrix[0].length; j++) {
      System.out.print (arrangerMatrix[i][j]+" ");
     }//j
        System.out.println ();
    }//i
     }
    public void displayResult(){
       System.out.println ("The result is "+arrangerResult);
     }

 }

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