简单的js问题：请问怎么在js里面实现求一个矩阵的数学期望值？

Question

简单的js问题：请问怎么在js里面实现求一个矩阵的数学期望值？

Answer 1

var variance = function(numbers) {var mean = 0;var sum = 0;for(var i=0;i<numbers.length;i++){sum += numbers[i];}mean = sum / numbers.length;sum = 0;for(var i=0;i<numbers.length;i++){sum += Math.pow(numbers[i] - mean , 2);}return sum / numbers.length;};

Answer 2

var sum=0arr.foreach((value,index)=>{sum+=arr[index]})var mean=sum/arr.length()

Answer 3

var mean = 0;var sum = 0;for(var i=0;i<numbers.length;i++){sum += numbers[i];