[R] cross table

[Antonio Olinto]

Hi,

I have a dataframe with 3 columns: month (1 to 12), length and length class.

I'm trying to make a cross table with the counts of lengths per length class 
and month. I don´t have all classes per month.

    | 1 2 3 ...
-------------
120 | 0 1 0
150 | 5 6 0
170 | 3 0 7
...

I have already tryed many commands, without success - unfortunately.

May someone help me? Thanks in advance!

Antonio Olinto



-------------------------------------------------
WebMail Bignet - O seu provedor do litoral
www.bignet.com.br