Re: [R] matching strings in a list
Thank you all very much! -- View this message in context: http://r.789695.n4.nabble.com/matching-strings-in-a-list-tp4709967p4710015.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
[R] matching strings in a list
Say I have a list: [[1]] I like google [[2]] Hi Google google [[3]] what's up and they are tweets. And I want to find out how many tweets mention google (the answer should be 2). If I string split and unlist them, then I would get the answer of 3. How do I make sure I get just 2? -- View this message in context: http://r.789695.n4.nabble.com/matching-strings-in-a-list-tp4709967.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
Re: [R] matching strings in a list
On Jul 16, 2015, at 12:40 PM, tryingtolearn inshi...@ymail.com wrote: Say I have a list: [[1]] I like google [[2]] Hi Google google [[3]] what's up and they are tweets. And I want to find out how many tweets mention google (the answer should be 2). If I string split and unlist them, then I would get the answer of 3. How do I make sure I get just 2? See ?grepl presuming that you just want a count of the matches. If you want it to also be case insensitive, set 'ignore.case = TRUE’. For example: Tweets - list(I like google, Hi Google google, what's up”) Tweets [[1]] [1] I like google [[2]] [1] Hi Google google [[3]] [1] what's up” sapply(Tweets, function(x) grepl(google, x, ignore.case = TRUE)) [1] TRUE TRUE FALSE sum(sapply(Tweets, function(x) grepl(google, x, ignore.case = TRUE))) [1] 2 Regards, Marc Schwartz __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
Re: [R] matching strings in a list
Why would you strsplit them? I would think length(grep(google, unlist(x), ignore.case = TRUE)) should do it. Best, Ista On Thu, Jul 16, 2015 at 1:40 PM, tryingtolearn inshi...@ymail.com wrote: Say I have a list: [[1]] I like google [[2]] Hi Google google [[3]] what's up and they are tweets. And I want to find out how many tweets mention google (the answer should be 2). If I string split and unlist them, then I would get the answer of 3. How do I make sure I get just 2? -- View this message in context: http://r.789695.n4.nabble.com/matching-strings-in-a-list-tp4709967.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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. __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
Re: [R] matching strings in a list
On Thu, Jul 16, 2015 at 12:40 PM, tryingtolearn inshi...@ymail.com wrote: Say I have a list: [[1]] I like google [[2]] Hi Google google [[3]] what's up and they are tweets. And I want to find out how many tweets mention google (the answer should be 2). If I string split and unlist them, then I would get the answer of 3. How do I make sure I get just 2? NROW(grep(google,list,ignore.case=TRUE)) -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! John McKown [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
Re: [R] matching strings in a list
On Thu, Jul 16, 2015 at 1:00 PM, John McKown john.archie.mck...@gmail.com wrote: On Thu, Jul 16, 2015 at 12:40 PM, tryingtolearn inshi...@ymail.com wrote: Say I have a list: [[1]] I like google [[2]] Hi Google google [[3]] what's up and they are tweets. And I want to find out how many tweets mention google (the answer should be 2). If I string split and unlist them, then I would get the answer of 3. How do I make sure I get just 2? NROW(grep(google,list,ignore.case=TRUE)) Or sum(grepl(google,x,ignore.case=TRUE)) -- Schrodinger's backup: The condition of any backup is unknown until a restore is attempted. Yoda of Borg, we are. Futile, resistance is, yes. Assimilated, you will be. He's about as useful as a wax frying pan. 10 to the 12th power microphones = 1 Megaphone Maranatha! John McKown [[alternative HTML version deleted]] __ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
