Lauri Nikkinen wrote: > Hi R-users, > > I'm quite new to R and trying to learn the basics. I have a following > problem concerning the convertion of array object into data frame. I have > made following data sets > > tmp1 <- rnorm(100) > tmp2 <- gl(10,2,length=100) > tmp3 <- as.data.frame(cbind(tmp1,tmp2)) > tmp3.sum <- tapply(tmp3$tmp1,tmp3$tmp2,sum) > tmp3.sum <- as.data.frame(tapply(tmp1,tmp2,sum)) > and I want the levels from tmp2 be shown as a column in the data.frame, not > as row name as it now does. To put it in another way, as a result, I want a > data frame with two columns: levels and the sums of those levels. Row names > can be, for example, numbers from 1 to 10.
aggregate(tmp3[1], tmp3[2], sum) tmp2 tmp1 1 1 8.41550650 2 2 3.65831086 3 3 -0.26296334 4 4 3.45368671 5 5 -4.64383794 6 6 0.25640949 7 7 0.02832348 8 8 -0.03811150 9 9 1.41724121 10 10 -1.06780900 ?aggregate > -Lauri Nikkinen > Lahti, Finland > > [[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. -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ 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.