r - Calculate cumulative standard deviation -

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this question has answer here:

i'm trying calculate standard deviation of values in time series, i'd incrementally advancing 1 day initial date value each time. know there way in r (probably using ddply?) doesn't involve nasty for-loop. help!

d<-seq(from=as.date("2013-01-01"), to=as.date("2013-02-01"), by="day") v <-rnorm(32, 10, 5) test.df<-data.frame(the_date=d, value=v)

here's way i'm doing now. 

result <- c() for(i in 2:nrow(test.df)){ result[i-1] <- sd(test.df[1:i,]$value)}

use ttr::runsd cumulative=true.

library(ttr) x <- xts(test.df[,2],test.df[,1]) runsd(x, n=1, cumulative=true)

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