兩個矩陣相加的方法（double [] []）

Question

我正在編寫一個程序進行矩陣計算，我想知道這樣的事情是否可以作為添加兩個矩陣的方法。

    public Matrix add(Matrix that) {
        int first = this.that.length;
        int second = this.that[0].length;
        double[][] third = new double[first][second];
        for (int i = 0; i < first; i++)
            for (int j = 0; j < second; j++)
                third[i][j] = first[i][j] + second[i][j];
        return third; 

我需要從main獲得這樣的輸出（我假設）

Matrix first = new Matrix(new double[][]{{2, 8},{-4, 6},{0, -2}});
Matrix second = new Matrix(new double[][]{{-6, 2},{0, 2},{8, -10}});
Matrix third = first.add(second);  
System.out.println("third:\n" + third);
System.out.println("first:\n" + first);


third:
-4.0 10.0
-4.0 8.0
 8.0 -8.0
first:
2.0 8.0
-4.0 6.0 
0.0 -2.0

運行此代碼會出現以下錯誤：

數組是必需的，但在為“ third [i] [j] ...”行編譯時發現int並報錯：不兼容的類型：double [] []無法轉換為返回的Matrix到Matrix

Answer 1

我正在編寫一個程序進行矩陣計算，我想知道這樣的事情是否可以作為添加兩個矩陣的方法。

    public Matrix add(Matrix that) {
        int first = this.that.length;
        int second = this.that[0].length;
        double[][] third = new double[first][second];
        for (int i = 0; i < first; i++)
            for (int j = 0; j < second; j++)
                third[i][j] = first[i][j] + second[i][j];
        return third; 

我需要從main獲得這樣的輸出（我假設）

Matrix first = new Matrix(new double[][]{{2, 8},{-4, 6},{0, -2}});
Matrix second = new Matrix(new double[][]{{-6, 2},{0, 2},{8, -10}});
Matrix third = first.add(second);  
System.out.println("third:\n" + third);
System.out.println("first:\n" + first);


third:
-4.0 10.0
-4.0 8.0
 8.0 -8.0
first:
2.0 8.0
-4.0 6.0 
0.0 -2.0

運行此代碼會出現以下錯誤：

數組是必需的，但在為“ third [i] [j] ...”行編譯時發現int並報錯：不兼容的類型：double [] []無法轉換為返回的Matrix到Matrix