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 -- View this message in context: http://r.789695.n4.nabble.com/Problem-with-loop-tp4148083p4148083.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.