[R] %in% operator - NOT IN

[Duncan Mackay]

At 19:06 08/05/2011, you wrote:
>Hello everyone,
>
>I am attempting to use the %in% operator with the ! to produce a NOT IN type
>of operation. Why does this not work? Suggestions?
>
> > data2[data1$char1 %in% c("string1","string2"),1]<-min(data1$x1)
> > data2[data1$char1 ! %in% c("string1","string2"),1]<-max(data1$x1)+1000
>
>Error: unexpected '!' in "data2[data1$char1 !"
>
>
>Thanks!
>
>Dan
>
>XXXX
>
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>
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Hi Dan

See the last of the examples for ?match

"%w/o%" <- function(x, y) x[!x %in% y] #--  x without y
(1:10) %w/o% c(3,7,12)

I think it was Peter Dalgaard who pointed this out some years ago

HTH

Regards


Duncan Mackay
Department of Agronomy and Soil Science
University of New England
ARMIDALE NSW 2351
Email: home mackay at northnet.com.au