rowStdp

1.30.14 新版功能.

语法

rowStdp(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标准差操作,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])
$ rowStdp(m);
[1.517307556898806,1.203698005684518,2.2]

$ 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);
$ rowStdp(t1);
[3.858612300930075,3.091206165165235,2.357022603955159,1.699673171197595,1.247219128924648]

$ rowStdp(t1[`x], t2, 1 1 2 2 2);
[2.785677655436824,2.727636339397171,2.638181191654584,2.966479394838265,3.42928563989645]


$ 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,rowStdp(price1,price2) as stdp from t;

sym

stdp

AAPL

62.815

MS

10.65

IBM

10.4

IBM

10.635

C

74.37

相关函数: rowStd, std