[R] remove columns having a partial match name
jholtman at gmail.com
Wed Jul 18 14:04:40 CEST 2007
DATA_OK <- DATA[-grep("^Start", names(DATA)),]
On 7/18/07, João Fadista <Joao.Fadista at agrsci.dk> wrote:
> Dear all,
> I would like to know how can I retrieve a data.frame without the columns that have a partial match name. Let´s say that I have a data.frame with 200 columns and 100 of them have the name "StartX", with X being the unique part for each column name. I want to delete all columns that have the name starting with "Start". I´ve tried to do this but it doesn´t work:
> > DATA_OK <- DATA[,-match(("Start*"),names(DATA))]
> > dim(DATA_OK)
> Thanks in advance.
> Best regards
> João Fadista
> Ph.d. student
> UNIVERSITY OF AARHUS
> Faculty of Agricultural Sciences
> Dept. of Genetics and Biotechnology
> Blichers Allé 20, P.O. BOX 50
> DK-8830 Tjele
> Phone: +45 8999 1900
> Direct: +45 8999 1900
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