我試過關注這個你 如何在java中正確附加兩個二維數組？ 刪除所有數組副本，但出現問題。我還嘗試了另一個指南，但只有在行相同的情況下才有效。public int [][] appendMatrix(int[][]matrix, int [][] matrix2) { this.matrix = new int[matrix.length + matrix2.length][matrix[0].length]; for(int i = 0; i < matrix.length; i++) { for(int j = 0; j < matrix[i].length; j++) { this.matrix[i][j] = matrix[i][j]; } for(int j = matrix.length; j < matrix.length + matrix2.length; j++) { this.matrix[i][j]= matrix2[i-matrix.length][j]; } } return this.matrix;**
1 回答
素胚勾勒不出你
TA貢獻1827條經驗 獲得超9個贊
需要考慮的重要一點是，當我們從第一個矩陣的最后一行開始時，我們希望保留該值，以便我們可以使用它將第二個矩陣的第一行到第 n 行添加到我們的結果矩陣中，而不會丟失軌道.
package matrix;
// I know you don't want to use imports, this is simply for testing purposes.
import java.util.Arrays;
public class MatrixAddition
{
public static void main(String[] args)
{
int[][] matrix1 =
{
{ 1, 2, 3 },
{ 4, 5, 6 },
{ 7, 8, 9 },
{ 10, 11, 12 } };
int[][] matrix2 =
{
{ 1, 1, 1 },
{ 2, 3, 4 } };
System.out.println("Appending the two matrices results in: ");
System.out.println(Arrays.deepToString(twoDMatrixAppend(matrix1, matrix2)));
printMatrix(twoDMatrixAppend(matrix1, matrix2));
System.out.println("\nPrepending the two matrices results in: ");
System.out.println(Arrays.deepToString(twoDMatrixPrepend(matrix1, matrix2)));
printMatrix(twoDMatrixPrepend(matrix1, matrix2));
}
private static int[][] twoDMatrixAppend(int[][] matrix1, int[][] matrix2)
{
if (matrix1[0].length != matrix2[0].length)
{
return null; // Or throw new incompatible matrices exception
}
int resultingRowLength = matrix1.length + matrix2.length; // The new length of the resulting matrix
int[][] result = new int[resultingRowLength][matrix1[0].length];
int currentRow, col, matrixTwoRowStart;
for (currentRow = 0; currentRow < matrix1.length; currentRow++)
{
for (col = 0; col < matrix1[0].length; col++)
{
result[currentRow][col] = matrix1[currentRow][col];
}
}
for (matrixTwoRowStart = 0; matrixTwoRowStart < matrix2.length; matrixTwoRowStart++, currentRow++)
{
for (col = 0; col < matrix2[0].length; col++)
{
result[currentRow][col] = matrix2[matrixTwoRowStart][col];
}
}
return result;
}
private static int[][] twoDMatrixPrepend(int[][] matrix1, int[][] matrix2)
{
return twoDMatrixAppend(matrix2, matrix1);
}
private static void printMatrix(int[][] arr)
{
System.out.println();
int row, col;
for (row = 0; row < arr.length; row++)
{
for (col = 0; col < arr[0].length; col++)
{
System.out.print(String.format("%4d", arr[row][col]));
}
System.out.println();
}
}
}
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