如何在Java中减去Arraylist的两个2D数组？

Question

我有arraylist

ArrayList <double[][]>deltaedge=new ArrayList<double [][]>();

其中包含2个2d双重数据类型数组，我必须从数组1中减去假设数组0，然后将结果再次存储在数组0中。

Answer 1

double[][] one=deltaedge.get(0);
double[][] two=deltaedge.get(1);
double[][] three=Subtraction(one,two);//call this method

deltaedge.set(0, three);// set the result to zero position
// subtract method
public double[][] Subtraction(double[][] one, double[][] two) {
    double[][] C = new double[one.length][one.length];
    for (int r = 0; r < 2; r++) {
        for (int c = 0; c < 2; c++) {
            C[r][c] = one[r][c] - two[r][c];
        }
    }
    return C;
}