On 27.01.2013 07:11, ypodeswa wrote:
Actually, it worked perfectly for my sample data, but my actual data has
5.5 million rows, and grep doesn't seem to work with over a million rows.
Any idea on a workaround?
It is not a matter of grep() but of available memory, I guess.
Hence try to reduce the number of copies of your data, e.g. by not
generating an interim df2.
Best,
Uwe Ligges
On Sat, Jan 26, 2013 at 9:37 PM, Yasha Podeswa <ypode...@gmail.com> wrote:
Awesome, thanks Arun, that's exactly what I was looking for!
On Sat, Jan 26, 2013 at 9:21 PM, arun kirshna [via R] <
ml-node+s789695n4656749...@n4.nabble.com> wrote:
Hi,
Try this:
df[]<-lapply(df,as.character)
df2<-df
df[,1][grep("@",df$names)]<- ""
df
#names emails
#1 bob b...@cup.com
#2 joe joesm...@gmail.com
#3 cr...@gmail.com
#4 emily emi...@yahoo.com
#5 j...@yahoo.com
#2nd part:
df2[-grep("@",df2$names),]
names emails
#1 bob b...@cup.com
#2 joe joesm...@gmail.com
#4 emily emi...@yahoo.com
A.K.
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