JavaScript - 对同一行和同一列中的值求和

Question

我怎样才能对同一行和同一列的值求和，并生成另一个结果数组(可以是一维的)。

Array [
    [ 1, 1, 0, 1 ],
    [ 1, 1, 1, 1 ],
    [ 1, 1, 1, 1 ],
    [ 1, 1, 0, 1 ]
]

Answer 1

var res = [];  //the 1D array to hold the sums
var hArr =  [
   [ 1, 1, 0, 1 ],
   [ 1, 1, 1, 1 ],
   [ 1, 1, 1, 1 ],
   [ 1, 1, 0, 1 ]
]; //your array


var vArr = []; //Now lets create an array of arrays with the columns of hArr

for (var j=0; j<hArr[0].length; j++) {
  var temp = [];
  for (var i=0; i<hArr.length; i++) {
      temp.push(hArr[i][j]);
  }
  vArr.push(temp);
}

//sum all the element in the line - Vertically and Horizontally
function SumVH (hInd, vInd) {
  var sum = 0;
  //add horizontal elements
  for(var i=0; i<hArr[hInd].length; i++) {
    sum += hArr[hInd][i];
  }
  //add vertical elements
  for(var i=0; i<vArr[vInd].length; i++) {
    sum += vArr[vInd][i];
  }
  //console.log("hInd="+hInd+" vInd="+vInd+" Sum="+sum);
  return sum;
}

// go through the main array and get result
var sumR = 0;
//sum of each row
for (var i=0; i<hArr.length; i++) {
   for (var j=0; j<hArr[i].length; j++) {
      sumR = SumVH(i,j) - (2 * hArr[i][j]);
      res.push(sumR);
   }   
}

请立即检查。变量 res 保存结果

For my array writen above I want result array like 7, 7, 5, 7, 8, 8, 6, 8, 8, 8, 6, 8, 7, 7, 5, 7

现在上面的代码并没有将数字本身计算在总和中。但要获得结果作为您的评论，请替换此行

sumR = SumVH(i,j) - (2 * hArr[i][j]);

与

sumR = SumVH(i,j);

谢谢。