On 25/01/12 09:45, Sam Steingold wrote:
I get this error from read.table():
Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, :
line 234 did not have 8 elements
The error is genuine (an extra field separator between 1st and 2nd element).
1. is there a way to see this bad line 234 from R without diving into the file?
2. is there a way to ignore the bad lines and get the data from the good
lines only (I do want to see the bad lines, but I don't want to stop all
work until some issue which causes 1% of data is resolved).
thanks.
Oh, yeah, a reproducible example:
read.csv from
=====
a,b
1,2
3,4
5,,6
7,8
=====
I want to be able to extract the data frame
a b
1 1 1
2 3 4
3 7 8
and a list of strings of length 1 containing "5,,6".
Try:
xxx <- readLines("<filename>")
hhh <- read.csv(textConnection(xxx[1]),header=FALSE)
yyy <- hhh[-1,]
names(yyy) <- hhh[1,]
bad <- list()
j <- 0
for(i in 2:length(xxx)) {
tmp <- read.csv(textConnection(xxx[i]),header=FALSE)
if(ncol(tmp)==ncol(yyy)) yyy <- rbind(yyy,tmp) else {
j <- j+1
bad[[j]] <- tmp
}
}
closeAllConnections()
HTH
cheers,
Rolf Turner
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