Question

当我运行该程序时，浏览器告诉我moy是NaN但我注意使用.map（Number）将数组转换为数字。我需要一些帮助。

＆＃13;

var score = [];
var i = 0;
var choice = 0;
while(choice != null){
i++;
score.push(prompt("put the score number "+i));
score = score.map(Number);
choice = prompt("to continue click on ok to cancel click on cancel");
}
var sum = 0,moy;
for(a=0;a<=i;a++) {
sum = sum+score[a];
moy = sum/i;
}
document.write("you put  "+i+" score(s) <br>and the average is"+moy);

＆＃13;

Answer 1

此行中存在语法错误

Slope = function(x) {
    TempDF = data.frame(x, year=1:ncol(data))
    lm(x ~ year, data=TempDF)$coefficients[2]
}

TData = as.data.frame(t(data))
data$slope = sapply(TData, Slope)
data
  Year1 Year2 Year3 Year4 slope
1     4     0     5    18   4.7
2     2    10     6     4   0.2

定义一个像这样的变量

for(a=0;a<=i;a++) {

将array.push。（prompt（））转换为数字

1 个答案: