TY so much david. We are getting close. But I need to keep "USD" in my object name (i.e "STANDARD LEAD USD")
*************************** Arnaud Gaboury Mobile: +41 79 392 79 56 BBM: 255B488F *************************** > -----Original Message----- > From: David Winsemius [mailto:dwinsem...@comcast.net] > Sent: Wednesday, April 28, 2010 2:25 PM > To: arnaud Gaboury > Cc: r-help@r-project.org > Subject: Re: [R] data frame manipulation and regex > > > On Apr 28, 2010, at 5:14 AM, arnaud Gaboury wrote: > > > Dear group, > > > > Here is my data.frame : > > > > avprix <- > > structure(list(DESCRIPTION = c("CORN Jul/10", "CORN May/10", > > "ROBUSTA COFFEE (10) Jul/10", "SOYBEANS Jul/10", "SPCL HIGH GRADE > > ZINC USD > > Jul/10", > > "STANDARD LEAD USD Jul/10"), prix = c(-1.5, -1082, 11084, 1983.5, > > -2464, -118), quantity = c(0, -3, 8, 2, -1, 0)), .Names = > > c("DESCRIPTION", > > "prix", "quantity"), row.names = c(NA, -6L), class = "data.frame") > > > >> avprix > > DESCRIPTION prix quantity > > 1 CORN Jul/10 -1.5 0 > > 2 CORN May/10 -1082.0 -3 > > 3 ROBUSTA COFFEE (10) Jul/10 11084.0 8 > > 4 SOYBEANS Jul/10 1983.5 2 > > 5 SPCL HIGH GRADE ZINC USD Jul/10 -2464.0 -1 > > 6 STANDARD LEAD USD Jul/10 -118.0 0 > > > > I need to remove the date (i.e. Jul/10 in this example) for each > > element of > > the DESCRIPTION column that contains the USD symbol. I am trying to > > do this > > using regular expressions, but must admit I am going nowhere. > > My elements in the DESCRIPTION column and the dates can change every > > day. > > This searches for the pattern USD and then replaces any three > characters , forward-slash, any two characters: > > sub("USD+.*(.../..)", "", avprix$DESCRIPTION) > [1] "CORN Jul/10" "CORN May/10" "ROBUSTA > COFFEE (10) Jul/10" > [4] "SOYBEANS Jul/10" "SPCL HIGH GRADE ZINC " > "STANDARD LEAD " > > This tightens up the matching by requiring that that the characters > after the slash be digits: > > > sub("USD+.*(.../\\d{2})", "", avprix$DESCRIPTION) > [1] "CORN Jul/10" "CORN May/10" "ROBUSTA > COFFEE (10) Jul/10" > [4] "SOYBEANS Jul/10" "SPCL HIGH GRADE ZINC " > "STANDARD LEAD " > > -- David. > > > > > > > > TY for any help. > > > > ______________________________________________ > > R-help@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. > > David Winsemius, MD > West Hartford, CT ______________________________________________ R-help@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.
