[R] a issue about the qutation mark?

[karena]

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


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