bbslover wrote:
>
> e.g.
>
> a=
> a b c d e
> 1 1 1 3 1 1
> 2 1 2 3 4 5
> 3 1 3 3 8 3
> 4 1 4 3 3 5
> 5 1 1 3 1 1 I want to delete colume a and colume c, because they
> have the same values in every row, then ,I want to get this data.frame .
>
> b=
> b d e
> 1 1 1 1
> 2 2 4 5
> 3 3 8 3
> 4 4 3 5
> 5 1 1 1
>
Try this
xdf <- apply(data.f, 2, function(x) x==x[1])
data.f <- data.f[,!apply(xdf,2,all)]
data.f
--
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