[R] Problem with a Matrix

Hamada Elsayed Ali medo_botany at hotmail.com
Thu Mar 8 11:12:25 CET 2012

Hi Petr,

Finally, I got the solution like you explained and I find another one like
the following:

Cover <- tapply(cover[,3], cover[, c(1,2)], c)

It is working great.

Thanks for your help,

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