Re: [R] basic problem but can't solve it
If I understood correctly, the initial post asked for a vector of the same length as the original one. This is why I suggested: tapply(Measure,Month,mean)[as.character(Month)] btw, this is handy way to compute deviations from the means of subgroups (x - tapply(x, group, mean)[as.character(group)]) Christophe Pallier On 5/22/07, John Kane [EMAIL PROTECTED] wrote: aggregate(Measure, list(Month=Month), mean) --- Benoit Chemineau [EMAIL PROTECTED] wrote: Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Christophe Pallier (http://www.pallier.org) [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] basic problem but can't solve it
Use ave. Assuming DF is your 2 column data frame: ave(DF[,1], DF[,2], FUN = mean) On 5/22/07, Benoit Chemineau [EMAIL PROTECTED] wrote: Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] basic problem but can't solve it
Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] basic problem but can't solve it
Benoit, Try the aggregate() function. -Cody Cody Hamilton, PhD Edwards Lifesciences Benoit Chemineau benoitchemineau@ To gmail.comr-help@stat.math.ethz.ch Sent by: cc [EMAIL PROTECTED] at.math.ethz.ch Subject [R] basic problem but can't solve it 05/22/2007 10:01 AM Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] basic problem but can't solve it
On Tue, 2007-05-22 at 19:01 +0200, Benoit Chemineau wrote: Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 If dat is a data frame containing your data: dat Measure Month 12.28 5 2 14.04 5 30.60 5 40.21 6 50.96 6 60.75 6 71.28 6 aggregate(dat$Measure, by = list(Month = dat$Month), mean) Monthx 1 5 5.64 2 6 0.80 tapply(dat$Measure, dat$Month, mean) 56 5.64 0.80 see ?aggregate and ?tapply for two solutions. The tapply one seems cleaner and easier to get the vector you need, the aggregate version needs an extra step: aggregate(dat$Measure, by = list(Month = dat$Month), mean)$x ^^ Note the $x at the end to subset the object returned by aggregate HTH G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] basic problem but can't solve it
tapply(Measure,Month,mean)[as.character(Month)] -- Christophe Pallier (http://www.pallier.org) On 5/22/07, Benoit Chemineau [EMAIL PROTECTED] wrote: Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] basic problem but can't solve it
aggregate(Measure, list(Month=Month), mean) --- Benoit Chemineau [EMAIL PROTECTED] wrote: Hello, I have a basic problem but i can't figure it out with the table underneath. I would like to compute monthly averages. I would like to have the average measure for month #5 for the first three rows (the same number in the first three lines) and the average measure for month #6 for the last four rows ((the same number in the first three lines) in a separate vesctor (let's call it 'result') I tried to use a while statement inside a for loop but it doesn't seem to work. Can someone please help me with this ? Measure Month 2.28 5 14.04 5 0.60 5 0.21 6 0.96 6 0.75 6 1.28 6 Thank you ! [[alternative HTML version deleted]] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
