[R] number of distinct values in a dataframe

[Rado Bonk]

Hi R-users,

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.

Thanks,

Rado

-- 
Radoslav Bonk M.S.
Dept. of Physical Geography and Geoecology
Faculty of Sciences, Comenius University
Mlynska Dolina 842 15, Bratislava, SLOVAKIA
tel: +421 905 968 127 e-mail: rbonk at host.sk