二维阵列水平平均输出 [英] two dimensional array horizontal average output

问题描述

我遇到了问题，我不知道怎么把它放在for循环中。
我需要下一个矩阵的hotizontal平均值：

I am stuck with a problem and i don't know how to put this in a for loop. I need the hotizontal average of the next matrix:

1 2 3 4 5

5 4 3 2 1

3 2 1 4 5

我是什么到目前为止：

var dArray = [[1, 2, 3, 4, 5], [5, 4, 3, 2, 1], [3, 2, 1, 4, 5]];

    for (x=0; x<dArray.length; x++)
    {
      //this loop needs to go trough each horizontal matrix and put 
      //the average in a variable so i can print it later
      //average .... team[0][x] something?
      //document.write(average)
    }

最终产品是这样的内容

我想在最后制作一张桌子，并将平均每个数组

I want to make a table at the end and put the average per "array

Arr 0  1 2 3 4 5  average:

Arr 1  5 4 3 2 1  average:

Arr 2  3 2 1 4 5  average:

推荐答案

方法：

var dArray = [[1, 2, 3, 4, 5],[5, 4, 3, 2, 1],[3, 2, 1, 4, 5]];
alert(dArray.map(function (a) {
    return (a.reduce(function (x, y) {return (x + y);})/a.length);
}));

实施：

<div id="matrix"></div>
<script>
    var dArray = [[1, 2, 3, 4, 5],[5, 4, 3, 2, 1],[3, 2, 1, 4, 5]];
    var buffer='';
    dArray.map(function (a) {
        buffer+= a.toString()+","+ (a.reduce(function (x, y) {return (x + y);})/a.length)+"<br/>";
    });
    document.addEventListener('DOMContentLoaded',function(){
        document.getElementById('matrix').innerHTML=buffer;
    },false);
</script>

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