计算二维数组中列的总和

Question

我想计算二维数组中每列的总和。 到目前为止，我得到这样的：在二维数组

public static double[] colMean(double[][] array){ 
    double arrayCopy[] = new double[array.length]; 

    for(int i = 0; i < array.length; i++){ 
     double colSum = 0; 
     for(int k = 0; k < array.length ; k++){ 
      colSum = colSum + array[k][i]; 
     }  
     arrayCopy[i] = colSum; 
    } 
    return arrayCopy; 
} 

Answer 1

//Create a destination array to store column sums 
//I'm supposing every row has the same number of columns 
for (int i=0; i<array[0].length; i++) { 
    destination_array[i]=0; 
} 

//Traversing the 2D array 
for (int i=0;i<array.length; i++) { 

    //Adding each column value at the column accumulator 
    for (int k=0;k<array[i].length;k++ { 
     destination_array[k]+=array[i][k]; 
    } 
} 

希望它可以帮助

Answer 2

你循环如下：

for(int i = 0; i < array.length; i++){ 
     double colSum = 0; 
     for(int k = 0; k < array[i].length ; k++){ 
      colSum = colSum + array[i][k]; 
     }