[R] How to read more than 1 table?

[Kjetil Brinchmann Halvorsen]

Atte Tenkanen wrote:
> Question 1) I want to read many csv-tables and run the same commands for
> all of them. Is there some simpler solution than this below to solve this
> problem?
> 
> 
> for (g in 1:6)
> {
> 
> if (g==1){k="kt1_0057"}
> if (g==2){k="kt1_0101"}
> if (g==3){k="kt1_0613"}
> if (g==4){k="staten"}
> if (g==5){k="tenpenny"}
> if (g==6){k="fiddrunk"}
> 
> TABLE=read.table(paste("/home/user/",k,".csv",sep=""),sep = ",",
> na.strings=".",header=F,fill=TRUE);

put your filenames in a character vector filenames:
filenames <- paste( c("kt1_0057", ...), ".csv", sep="")
tables  <- lapply( filenames, function(x) read.table(file=x, na.strings= 
..., ...) )

and if you want to repeat the same task for your six tables do it with 
lapply()  or  sapply()

> 
> print(TABLE)
> 
> }
> 
> Question 2) Is it possible to create new variables for example with the
> assistance of for-loop without initialising them beforehand?

This way:
    sapply(1:10, function(i) your.task(i) )

sapply() will do the initialization for you!

Kjetil

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