关于expression和points返回结果出错

[NJAUzhangwenjun]

data:[
[1, "0.5"],[2, "0.75"],[3, "1"],[4, "1.25"],[5, "1.5"],[6, "1.75"],[7, "2"],[8, "2.25"],
]

返回错误数值：

myRegression.expression返回结果为：y = NaNx + NaN，
myRegression.points二维数组返回结果为：
 [
[1, NaN],[2, NaN],[3, NaN],[4, NaN],[5, NaN],[6, NaN],[7, NaN],[8, NaN]
]

[NJAUzhangwenjun]

已得到解决

[1234567845246]

已得到解决

请问你这个是怎么解决的