R help - Oct 2008 - R loops

hello everybody,

I have a directory with over 3000 files with different names. I would like 
to make some vectors with the file names which are belong together.

I'm trying to do it with a for loop in R:

SF <- c("ad", "cd", "cer", "stress",
"salty", "PC", "high", "transfer",
"cold", "heat") # the pattern to look for
names(SF) <- as.vector(SF)
for (i in 1:length(SF)){
        write(names(SF)[i], "")
        for (j in 1:length(SF))
                {list[j] <- grep(names(SF)[j], list.files(),value=TRUE) 
#character vector with the specified stress factor
                }
        }

but all I'm getting is this 

Error in list[j] <- grep(names(SF)[j], list.files(), value = TRUE) : 
  object of type 'builtin' is not subsettable

I would like the loop to make  in each round a list of the files with the 
pattern in the directory I'm looking in.

what am i doing wrong?

If I doing it for each element I'm getting the correct list.

THX for the help

Best Regards

Assa Yeroslaviz


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assa.yeroslaviz at bayercropscience.com wrote:
> hello everybody,
>
> I have a directory with over 3000 files with different names. I would like 
> to make some vectors with the file names which are belong together.
>
> I'm trying to do it with a for loop in R:
>
> SF <- c("ad", "cd", "cer",
"stress", "salty", "PC", "high",
"transfer",
> "cold", "heat") # the pattern to look for
> names(SF) <- as.vector(SF)
> for (i in 1:length(SF)){
>         write(names(SF)[i], "")
>         for (j in 1:length(SF))
>                 {list[j] <- grep(names(SF)[j], list.files(),value=TRUE) 
> #character vector with the specified stress factor
>                 }
>         }
>
> but all I'm getting is this 
>
> Error in list[j] <- grep(names(SF)[j], list.files(), value = TRUE) : 
>   object of type 'builtin' is not subsettable
>
> I would like the loop to make  in each round a list of the files with the 
> pattern in the directory I'm looking in.
>
> what am i doing wrong?
>   
list is a built-in function.  when you try list[i] (with or without
assignment) without having introduced, within the scope, a subsettable
object named 'list', you got a deserved error message.

otherwise, you'd better use lapply than a for loop.

vQ