rowVarp

New in version 1.30.14.

语法

rowVarp(args…)

row 系列函数通用参数说明和计算规则请参考: 行计算系列（row 系列）

详情

逐行进行元素求总体方差操作，返回一个长度与输入参数行数相同的向量。

例子

$ m=matrix([4.5 2.6 1.5, 1.5 4.8 5.9, 4.9 2.0 NULL]);
$ rowVarp(m);
[2.302222222222225,1.448888888888887,4.84]

$ t1=table(1..5 as x, 10..6 as y, take(3, 5) as z);
$ t2=table(5..1 as a, 6..10 as b, take(8, 5) as c);
$ rowVarp(t1);
[14.888888888888891,9.555555555555557,5.555555555555558,2.888888888888891,1.555555555555557]

$ rowVarp(t1[`x], t2, 1 1 2 2 2);
[7.76,7.440000000000001,6.96,8.8,11.760000000000001]

$ t=table(`AAPL`MS`IBM`IBM`C as sym, 49.6 29.46 29.52 30.02 174.97 as price1, 175.23 50.76 50.32 51.29 26.23 as price2);
$ select sym,rowVarp(price1,price2) as varp from t;

sym	varp
AAPL	3945.7242
MS	113.4225
IBM	108.16
IBM	113.1032
C	5530.8969