zhangyangsmith 发表于 2012-7-30 21:31
Change the last line of your code to:In R the priority of colon operator (:) is higher than plus (+) ...

chenyn68 发表于 2012-8-1 16:46
例如：i=1,i:i+3其实是(1:1)+3=3，所以上面的代码应该改为：
for(i in 1:3){
sigma=sd(sample)}