Re: [R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread Petr PIKAL
Hi Use ave instead of tapply. It is designed for such task Regards Petr r-help-boun...@r-project.org napsal dne 12.11.2010 10:49:17: > albechan > Odeslal: r-help-boun...@r-project.org > > 12.11.2010 10:49 > > Re: [R] filling a vector with a tapply function applied

Re: [R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread albechan
Thank you so much! That's exactly what I needed! much love -- View this message in context: http://r.789695.n4.nabble.com/filling-a-vector-with-a-tapply-function-applied-to-another-vector-tp3039271p3039396.html Sent from the R help mailing list archive at Nabble.com. ___

Re: [R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread Dennis Murphy
Hi: Look into the ave() function - here's a small demonstration: d <- data.frame(g = factor(rep(LETTERS[1:5], each = 5)), x = rpois(25, 10)) d$mean <- with(d, ave(x, g, FUN = mean)) head(d, 10) head(d, 10) g x mean 1 A 5 8.4 2 A 14 8.4 3 A 10 8.4 4 A 2 8.4 5 A 11 8

Re: [R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread albechan
The first column has 331 rows, the number of factors in the second column is 20 repeated in order to have 331 rows too. What I need is to reapeat in the third column each of the 20 results derived from tapply(firstcolumn,secondcolumn,mean) as many times as each factor appears in the second column.

Re: [R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread Santosh Srinivas
You could just create a new data frame with the result and cbind? On Fri, Nov 12, 2010 at 2:11 PM, albechan wrote: > > I have a data frame with three columns. The first one is filled with factors, > the second one with numeric values and the third one is an empty vector. > I need fill the third c

[R] filling a vector with a tapply function applied to another vector

2010-11-12 Thread albechan
I have a data frame with three columns. The first one is filled with factors, the second one with numeric values and the third one is an empty vector. I need fill the third column with the results of the function tapply(secondcolumn,firstcolumn,mean) so that I have for each row of the third column