Problem with loop

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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