Hi I want to search for multiple pattern as grep is doing for a single pattern, but this obviously not work:
> grep("an", month.name)
[1] 1
> grep("em", month.name)
[1] 9 11 12
> grep("eb", month.name)
[1] 2
> grep(c("an", "em", "eb"), month.name)
[1] 1
Warning message:
In grep(c("an", "em", "eb"), month.name) :
argument 'pattern' has length > 1 and only the first element will be used
>
Is there an equivalent which returns the positions as grep is doing, but
not using the strict full-string matching of match()?
I could obviously do:
> unlist( sapply(pat, grep, month.name ) )
an em1 em2 em3 eb
1 9 11 12 2
but is there a more compact command I am missing?
Thanks,
Rainer
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa
Tel : +33 - (0)9 53 10 27 44
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email: [email protected]
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