3楼: Originally posted by meatball1982 at 2013-05-03 13:26:37
LS程序没整好。

程序如下。
你可以自己试试std
如果数据比较多，会很接近你要的值，但不一定会正好相等。
但我认为12 个数确实是有点少。

clear all clc n1=3; n2=4; A=normrnd(0,0.02,n1,n2); mean(A( ...

2楼: Originally posted by meatball1982 at 2013-05-03 13:23:53
你给的数据太少了吧。

clear all
clc

n1=3;
n2=4;
A=normrnd(0,0.02,n1,n2);
mean(A()

n1=300;
n2=400;
A=normrnd(0,0.02,n1,n2);
mean(A()

n1=3000;
n2=40000;
A=normrnd(0,0.02,n1,n2); ...

clear all clc n1=3; n2=4; A=normrnd(0,0.02,n1,n2); mean(A(:)) n1=300; n2=400; A=normrnd(0,0.02,n1,n2); mean(A(:)) n1=3000; n2=40000; A=normrnd(0,0.02,n1,n2); mean(A(:))