Removing values containing a specific character

Hi Yasha,

?I guess you got Uwe's response. 

?I created `df2` with the intention of getting the two results from the original dataset.
For example, after you get the first result
df[,1][grep("@",df$names)]<- "" 
#you can get the second result by:
df[df$names!="",]
?# names???????????? emails
#1?? bob?????? bobj at cup.com
#2?? joe joesmith at gmail.com
#4 emily?? emily2 at yahoo.com

#or
df[grep("\\w+",df$names),]
#? names???????????? emails
#1?? bob?????? bobj at cup.com
#2?? joe joesmith at gmail.com
#4 emily?? emily2 at yahoo.com

But, I am? not sure how this will work over a 5.5 million rows. 
A.K.




----- Original Message -----
From: ypodeswa <ypodeswa at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Sunday, January 27, 2013 1:11 AM
Subject: Re: [R] Removing values containing a specific character

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?

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+s789695n4656749h63 at n4.nabble.com> wrote:

Hi,
Try this:
df[]<-lapply(df,as.character)
df2<-df
df[,1][grep("@",df$names)]<- ""
df
?  #names? ? ? ? ? ?  emails
#1?  bob? ? ? bobj at cup.com
#2?  joe joesmith at gmail.com
#3? ? ? ? ? craig at gmail.com
#4 emily? emily2 at yahoo.com
#5? ? ? ? ? jane at yahoo.com

#2nd part:

? df2[-grep("@",df2$names),]
?  names? ? ? ? ? ?  emails
#1?  bob? ? ? bobj at cup.com
#2?  joe joesmith at gmail.com
#4 emily? emily2 at yahoo.com
A.K.

------------------------------
? If you reply to this email, your message will be added to the
discussion below:

http://r.789695.n4.nabble.com/Removing-values-containing-a-specific-character-tp4656744p4656749.html
? To unsubscribe from Removing values containing a specific character, click
here<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4656744&code=eXBvZGVzd2FAZ21haWwuY29tfDQ2NTY3NDR8LTEyMTY0MzM4NDk=>
.
NAML<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>

--
View this message in context: http://r.789695.n4.nabble.com/Removing-values-containing-a-specific-character-tp4656744p4656751.html
Sent from the R help mailing list archive at Nabble.com.
??? [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.