I can exclude columns by column number using '-'. But I wondering if
there is an easy way to exclude some columns by column names.
> x=cbind(c(1,2),c(3,4))
> x
[,1] [,2]
[1,] 1 3
[2,] 2 4
> colnames(x)=c('a','b')
> x
a b
[1,] 1 3
[2,] 2 4
> x[,-'a']
Error in -"a" : invalid argument to unary operator
> x[,-1]
[1] 3 4
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