[R] Problem with loop

[Komine]

Hi, 
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  

>essai<-read.table("C:\\Users\\Desktop\\Matrices\\Mat2002273.csv",sep=";",dec=",",header=TRUE)
>essai
>a <- NULL 
>for(i in Mat2002273:Mat2002361){
>paste(mean(essai$Pixelvalues))
>a[i] <- paste(mean(essai$Pixelvalues))
>print(a[i])
>}

Thank you for your help 




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