[R] Problem with loop

Komine momadou at yahoo.fr
Fri Dec 2 18:15:56 CET 2011

I try to build a loop difficultly. 
I have in a folder called Matrices several files (.csv) called Mat2002273,
Mat2002274  to Mat2002361. 
I want to calculate for each file the mean of the column called Pixelvalues.
I try this code but as result, I have this message:  Mat2002273 not found  

>a <- NULL 
>for(i in Mat2002273:Mat2002361){
>a[i] <- paste(mean(essai$Pixelvalues))

Thank you for your help 

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