[R] number of distinct values in a dataframe

Thomas Lumley tlumley at u.washington.edu
Mon Sep 22 22:44:07 CEST 2003

On Mon, 22 Sep 2003, Douglas Bates wrote:

> Rado Bonk <rbonk at host.sk> writes:
> > How can I found the number of a distinct values in a data frame
> > (occurrence of distinct values)? The dataframe consists of several
> > thousands integer numbers.
> It is not clear if you are asking about the number of unique values in
> a column in a data frame or the number of unique rows in a data frame.
> If there is more than one column these answers could be different.
> The first is question is the easier one. Just use
>  length(unique(mydataframe$columnOfInterest))

The same works for the second question



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