R help - May 2011 - R - problem with my loops which operate on raster data

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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Stackoverflow users have attempted to help you improve your question -
please don't ignore advice this with an undeclared cross-post here:

http://stackoverflow.com/questions/5892548/problem-with-loops-in-r

For this list

"PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
and provide commented, minimal, self-contained, reproducible code."

Cheers, Mike.

On Thu, May 5, 2011 at 2:21 PM, mateokkk <vkedzior@is.pw.edu.pl> wrote:
> 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...
>
>
> --
> View this message in context:
>
http://r.789695.n4.nabble.com/R-problem-with-my-loops-which-operate-on-raster-data-tp3497533p3497533.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner@gmail.com

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