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=0
arr.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];