[R] how can I delete those columes with the same element in every row?

[Berend Hasselman]

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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