[R] conditional replacement - readLines

[Uwe Ligges]

Christian Schulz wrote:

> Hi,
> 
> i have list with 2575  cgi files which i have read with readLines - all 
> Lines have the type "chr".
> Now i want replace the 2. line with a condition in 4. line and  write  
> the files back  to dir.
> 
> How i could avoid the incompatible problem, or is it better
> doing something with awk!?
> 
> for (i in 1:2575){
> datenrep <- 
> ifelse(daten[[i]][4]=="type,1",cat(substr(as.character(paste(daten[[i]][2])),1,5),as.character(100) 

You don't want to cat() here!
(Also, you do want to use "if(){} else{}" rather than "ifelse()".)

Uwe Ligges


> ,substr(as.character(paste(daten[[i]][2])),6,12),sep=""),daten[[i]][2])}
> lfdn,1001081Error in "[<-"(`*tmp*`, test & !nas, value = NULL) :
>        incompatible types
> 
> many thanks, christian
> 
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