You need to understand the difference between a variable and a value. In your case that doesn't work, you are supplying a value, "trait.value". but you have no file named "trait.value".
In the case that does work you are supplying a variable, trait.value, and the value contained in that variable is the name of a file that does exist. It is not quite correct to say that when using read.csv() you put quotation marks outside the filename. What you do is supply read.csv() with the name of a file, and that name can either be a character string, or a variable whose value is a character string. -Don On 7/16/10 8:23 AM, "karena" <dr.jz...@gmail.com> wrote: > > Following is a function that I wrote (It is working well). It's a simple one, > nothing complicated. The only question that I have is a qutation mark issue, > I guess. > ############################################# > funcname <- function(trait.file){ #line1 > setwd('/root/subroot') # line 2 > load('imge.RData') # line3 > imge <- imge[,-c(3)] # line4 > imge <- imge[complete.cases(imge),] # line5 > trait<- read.csv(trait.file) # line6 > ngenes <- nrow(imge) # line7 > nsnp <- nrow(trait) #line 8 > for(i in 1:ngenes) { > for(j in 1:nsnp) { > if(imge$d1[i]==trait$d1[j] & imge$d2[i]==trait$d2[j]) trait$imgene2[j] <- > imge$Gene[i] > else trait$imgene2[j] <- NA > } > } > return(trait) > } > > hypertension <- funcname("folder/hyper.csv") # last line > ###################################### > > So, as we all know, when using "read.csv", we need to use qutation mark out > side the filename which we wanna read in. At first, for line 8, I wrote: > read.csv("trait.file"), at last line, I wrote: > funcname(folder/hyper.csv), but it did not work in this way. Unless I > changed the code to the current one that I showed above, I couldn't get what > I want. > So, to be straightforward, I will show the difference: > 1) the code not working: > read.csv("trait.file") #line 8 > funcname(folder/hyper.csv) #last line > > 2) the code working: > read.csv(trait.file) # line 8 > funcname("folder/hyper.csv") # last line > > anyone can tell me why is the difference? > > thank you, > > karena > -- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory 925 423-1062 ______________________________________________ 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.