How can compute rolling window for standard deviation in R?

Question

I tried to download the stock price and compute the standard deviation in rolling window. I found the library PerformanceAnalytics but they only have the rollin

Answer 1

Try this:

library(zoo)
rollapplyr(1:10, 3, sd, fill = NA)
## [1] NA NA  1  1  1  1  1  1  1  1

See ?rollapply for more info.