[R] R - problem with my loops which operate on raster data

[mateokkk]

library(rgdal) 
my_asc=dir("~/Pulpit/dods/karol/TVDI
113_121",pattern=".asc",recursive=T,full.names=T)
 for (i in 1:length(my_asc))
{
 r <- readGDAL(my_asc[i])
 z <- as.matrix(r)
 vectordata[i] <- mean(z)
 vectordatamax[i] <- max(z)
 vectordatamin[i] <- min(z)
 vectordev[i] <- sd(z,na.rm=True)
 hist(z)
 png(filename="hist"+tostring(i)+".png")
}

<li>I try to do some modyfication of this loop, but it still doesn't works -
which fragment is incorrect?
<li>I would like also to use more complicated pattern (to list only files
which contains on the end of it name two numbers), but adding something
like:
pattern="_??.asc" seems not works.
<li>I would like to add one more loop to get list of folders (instead of
manually inserting directories into my_asc variable), but I haven't got Idea
how I can do it?
<li>I do not know, why my way of creating vectors for mean, max, min and
standard deviation values is not working...


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