Re: [R] Sum up column values according to row id

77840-4352 > > > > > > -Original Message- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On > Behalf Of Matteo Mura > Sent: Wednesday, April 24, 2013 7:57 AM > To: r-help@r-project.org > Subject: [R] Sum up column values acc

[R] Sum up column values according to row id

Dear All, here a problem I think many of you can solve in few minutes. I have a dataframe which contains values of plot id, diameters, heigths and basal area of trees, thus columns names are: id | dbh | h | g head(ipso, n=10)id dbh h g 1 FPE0164 36 13.62 0.10178760 2 FPE0