[R] How to get the rolling standard deviation in rasters?

[Jonsson]

I am using this code to calculate the moving average mean.It worked fine but
when I wanted to also calculate based on sd(stander deviation) I got the
error shown below.
I read this documentation of R movingFun and found that sd was mentioned at 
http://hosho.ees.hokudai.ac.jp/~kubo/Rdoc/library/raster/html/movingFun.html

I wonder if needs any other things to conseder or sd is not at all supplied
by this function.

       sami<- list.files("C:\\Usersfinal-2010", "*.envi", full.names = TRUE)
        saf=stack(sami)
        dm <-  overlay(saf ,fun=function(x) movingFun(x, fun=mean, n=3,
na.rm=TRUE,fill=NA))
### worked very well

           ds <-  overlay(saf ,fun=function(x) movingFun(x, fun= sd, n=3,
na.rm=TRUE))
### did not work

           Error in .overlayList(x, fun = fun, filename = filename, ...) : 
             cannot use this formula, probably because it is not vectorized

          > saf
      class       : RasterStack 
      dimensions  : 720, 1440, 1036800, 12  (nrow, ncol, ncell, nlayers)
      resolution  : 0.25, 0.25  (x, y)
      extent      : -180, 180, -90, 90  (xmin, xmax, ymin, ymax)
     coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84
+towgs84=0,0,0 
      names       : SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast,
SM_RE01_M//7_amenlast,      SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast,
SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast,
SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast, SM_RE01_M//7_amenlast, 




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