设置对象值[JavaScript]时出错
我构建了一个标准偏差计算器,它使用对象按预期工作。但是,现在我想将每个对象中的设置对象值[JavaScript]时出错,javascript,jquery,object,javascript-objects,standard-deviation,Javascript,Jquery,Object,Javascript Objects,Standard Deviation,我构建了一个标准偏差计算器,它使用对象按预期工作。但是,现在我想将每个对象中的newScore属性设置为对象z分数((分数-平均值)/标准偏差) 然而,似乎每个对象都得到了相同的z分数,我不知道为什么 我做错了什么 HTML: JavaScript: var myArray = []; var sumOfScores; var mean; var variance; var secondArray = []; var thirdArray = []; var squaredSum; var s
newScore
属性设置为对象z分数((分数-平均值)/标准偏差)
然而,似乎每个对象都得到了相同的z分数,我不知道为什么
我做错了什么
HTML:
JavaScript:
var myArray = [];
var sumOfScores;
var mean;
var variance;
var secondArray = [];
var thirdArray = [];
var squaredSum;
var std;
$(document).ready(function () {
$('#push').on('click', function () {
var name = $('#name').val();
var score = parseInt($('#score').val());
myArray.push((student = {
name: name,
score: score,
newScore: null
}));
console.log(student);
$('#name').val("");
$('#score').val("");
});
$('#show').on('click', function () {
$('#list').html("");
for (i = 0; i < myArray.length; i++) {
$('#list').append("<li>" + myArray[i].name + " received a score of " + myArray[i].score + "</li>");
};
});
$('#doMath').on('click', function () {
sumOfScores = 0;
for (i = 0; i < myArray.length; i++) {
sumOfScores += myArray[i].score;
};
$('#sum').html("The sum is: " + sumOfScores);
mean = (sumOfScores / myArray.length);
$('#mean').html("The mean score is: " + mean);
variance = 0;
for (i = 0; i < myArray.length; i++) {
console.log(myArray[i].score);
secondArray.push(myArray[i].score - mean);
};
console.log(mean);
console.log("The second array is: " + secondArray);
for (i = 0; i < secondArray.length; i++) {
thirdArray.push(Math.pow(secondArray[i], 2));
};
console.log("The third array is: " + thirdArray);
squaredSum = 0;
for (i = 0; i < thirdArray.length; i++) {
squaredSum += thirdArray[i];
};
console.log("The squared sum is: " + squaredSum);
variance = 0;
variance = (squaredSum / ((thirdArray.length) - 1));
console.log("The variance is: " + variance);
$('#variance').html("The variance is: " + variance);
std = Math.sqrt(variance);
$('#std').html("The standard deviation is: " + std);
console.log("The standard deviation is: " + std);
//figure out z score
for (i = 0; i < myArray.length; i++) {
myArray[i].newScore = ((myArray[i].newScore - mean) / std);
};
for (i = 0; i < myArray.length; i++) {
console.log(myArray[i].newScore);
};
});
});
var myArray=[];
var-sumofscore;
var均值;
var方差;
var secondArray=[];
var thirdArray=[];
方差平方;
var-std;
$(文档).ready(函数(){
$('#push')。on('单击',函数(){
var name=$('#name').val();
var score=parseInt($('#score').val();
myArray.push((学生={
姓名:姓名,,
分数:分数,
新闻核心:空
}));
console.log(学生);
$('#name').val(“”);
$(“#分数”).val(“”);
});
$('#show')。在('click',函数(){
$('#list').html(“”);
对于(i=0;i”+myArray[i].name+”获得的分数为“+myArray[i].score+””;
};
});
$('doMath')。在('click',函数(){
sumOfScores=0;
对于(i=0;i
根据Abhitalks,第61行应为:
myArray[i].newScore = ((myArray[i].score - mean) / std);
鉴于,我有:
myArray[i].newScore = ((myArray[i].newScore - mean) / std);
这将不起作用,因为
newScore
不是该计算的值,并且被设置为null,您不能将其相乘。您可能需要(myArray[i].score-mean)
而不是(myArray[i].newScore-mean)
。您的newScore
默认设置为null
,因此从null
中减去mean
…就是这样,谢谢!
myArray[i].newScore = ((myArray[i].score - mean) / std);
myArray[i].newScore = ((myArray[i].newScore - mean) / std);