PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
What have you tried? In particular, have you tried "table"? Dates and times may present difficulties, but help.search('table') in R 1.9.1 alpha under Windows 2000 just produced a number of options.
hope this helps. spencer graves
Antonio Olin wrote:
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 Olin
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