Dear Rui,
I have a new problem with R. How can I do this summarize the ELM PRP for
each ua.
My data is like this:
ua ELM PRP
122C MO 5
122C BR 3
122C FA 1
122C MO 1
122D BR 7
122D MO 2
122D BR 1
and I want to obtain something like this:
ua ELM PRP
122C MO 6
122C BR 3
122C FA 1
122D BR 8
122D MO 2
Thank you very much!
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Catalin-Constantin ROIBU
Lecturer PhD, Forestry engineer
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone +4 0230 52 29 78, ext. 531
mobile phone +4 0745 53 18 01
+4 0766 71 76 58
FAX: +4 0230 52 16 64
silvic.usv.ro <http://silvic.usv.ro>