[R] how to count the columns of a data.frame

[ronggui]

> da<-data.frame(x=rnorm(10),y=rnorm(10))
> ncol(da)
[1] 2

or

> dim(da)[2]
[1] 2


2006/4/15, giacomo moro <gmbegnis at yahoo.it>:
> Hi,
>   I would like to count the columns of a data.frame. I know how to count the rows, but not the columns.
>   Can someone tell me how to do it?
>   My best regards,
>             Giacomo Moro
>
>
>
> ---------------------------------
>
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--
»ÆÈÙ¹ó
Deparment of Sociology
Fudan University