On 2013-03-19 06:41, Jonsson wrote:
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)
We're not sitting at your computer, so the above line is useless
information.
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
[...snip...]
This suggests that it might be useful to read ?Vectorize.
Peter Ehlers
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