The standard error is just the standard deviation divided by the square root of the sample size. So you can easily make your own function:
> std <- function(x) sd(x)/sqrt(length(x))
> std(c(1,2,3,4))
[1] 0.6454972
The standard error is just the standard deviation divided by the square root of the sample size. So you can easily make your own function:
> std <- function(x) sd(x)/sqrt(length(x))
> std(c(1,2,3,4))
[1] 0.6454972