How to find the average value of a two-dimensional array in javascript

Method for averaging in JS two-dimensional array: 1. Nested double-layer for loop traverses all elements in the two-dimensional array; 2. In the loop body, use "sum =arr1[i][j ]" statement adds up all array elements; 3. Divide the sum of array elements by the number of array elements to find the average.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript two-dimensional array average value

If we want to find the average value of a two-dimensional array, we need to first obtain the average value of the two-dimensional array For each element, add them up and divide by the number of elements.

So how to get each element of the two-dimensional array?

When you see this, you will think of a for loop, using array subscripts to get elements. Because it is a two-dimensional array, two levels of for loops must be nested: the first level controls the array row subscripts, and the second level controls the array column subscripts.

ok, let’s take a look at the implementation code:

var sum=0;
var B=0; //此变量的定义是为了记录数组内的元素总个数
var arr=[
[12,13,14,15],
[16,17,18,19],
[20,21,22,23]
];
for (var i=0;i<arr.length; i++) // arr1.length是数组行个数
{
for (var j=0;j<arr[i].length;j++) // arr1[i].length是数组列个数
{
sum+=arr[i][j];
B++;
}
}
document.write("平均值为："+sum/B);

Output results:

[Recommended learning: JavaScript advanced tutorial】

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