Hi,arun: Yes,your answer is what I want. A little different is : data.frame(t(t(dat)*z))
Because I wanna get the "data frame"type, not matrix. Thanks for your reply. At 2012-12-31 00:59:43,arun <smartpink...@yahoo.com> wrote: >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. > [[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.
