cumstd

详情

计算 X 元素的累计标准差。

例子

x = [1,2,4,NULL,8];
cumstd(x);
# output
[,0.707107,1.527525,1.527525,3.095696]

m=matrix(0.15 0.08 0.03 -0.14 -0.09, 0.2 -0.12 -0.16 0.08 0.16);
m;
#0 #1
0.15 0.2
0.08 -0.12
0.03 -0.16
-0.14 0.08
-0.09 0.16
cumstd(m);
#0 #1
0.049497474683058 0.226274169979695
0.060277137733417 0.19731531449265
0.123558353285671 0.169705627484771
0.119707978013163 0.16346253393362

相关函数:std