Next time you include a data frame that has spaces in the fields, please
consider using 'dput' to provided the data. It is hard to read in
otherwise.
Will this do it:
> x <- read.table(textConnection(" 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 Aug/10' -118.0 0"), header=TRUE, as.is
=TRUE)
.>
> x$DESCRIPTION <- sub("USD [[:alpha:]]+/[[:digit:]]+", "USD",
x$DESCRIPTION)
>
> x
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 -2464.0 -1
6 STANDARD LEAD USD -118.0 0
On Wed, Apr 28, 2010 at 7:13 AM, arnaud Gaboury <arnaud.gabo...@gmail.com>wrote:
> Dear group,
>
> I need to modify some characters in a data frame. I want to use gsub and
> the
> regex functionalities to do this.
>
> Here is the data frame (df):
>
> 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 Aug/10 -118.0 0
>
>
> For each df$DESCRIPTION element containing "USD" I want to remove the last
> part of it(i.e Jul/10, or Aug/10...).
> I was thinking of something like that:
>
> >Df$DESCRIPTION<-gsub("USD","new name whithout last part",df$DESCRIPTION)
>
> to get this following result:
>
>
> 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 -2464.0 -1
> 6 STANDARD LEAD USD -118.0 0
>
> My problem is that I have no idea how to write the regular expression in my
> command line.
>
> Any help would be appreciated.
>
> ______________________________________________
> 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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
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