HI, Its not clear esp " I wanna do the following: 10*x1,100*x2,1000*x3"
Did you mean 10* dat[,1], 100*dat[,2], 1000*dat[,3]? dat<-read.table(text=" x1 x2 x3 0.2 1.2 2.5 0.5 2 5 0.8 3 6.2 ",sep="",header=TRUE) z<-c(10,100,1000) # 3rd element in your z is 100, which is confusing. t(t(dat)*z) # x1 x2 x3 #[1,] 2 120 2500 #[2,] 5 200 5000 #[3,] 8 300 6200 A.K. ----- Original Message ----- From: meng <laomen...@163.com> To: R help <r-help@r-project.org> Cc: Sent: Sunday, December 30, 2012 5:26 AM Subject: [R] How to multiple the vector and variables from dataframe hi all: Here's a dataframe(dat) and a vector(z): dat: x1 x2 x3 0.2 1.2 2.5 0.5 2 5 0.8 3 6.2 > z [1] 10 100 100 I wanna do the following: 10*x1,100*x2,1000*x3 My solution is using the loop for z and dat(since the length of z is the same as ncol of dat),which is tedious. I wanna an efficient solution to do it . Any help? Many thanks! My best [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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@r-project.org 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.
