Many thanks arun! Your answer is the best one :)
At 2012-12-31 10:51:35,arun <[email protected]> wrote: >HI Meng, > >NO problem. >#In fact, >sweep(dat,2,z,"*") #will be data.frame > # x1 x2 x3 >#1 2 120 2500 >#2 5 200 5000 >#3 8 300 6200 > str(sweep(dat,2,z,"*")) >#'data.frame': 3 obs. of 3 variables: ># $ x1: num 2 5 8 ># $ x2: num 120 200 300 ># $ x3: num 2500 5000 6200 >A.K. > > > > > > >________________________________ >From: meng <[email protected]> >To: arun <[email protected]> >Cc: R help <[email protected]> >Sent: Sunday, December 30, 2012 9:40 PM >Subject: Re:Re: [R] How to multiple the vector and variables from dataframe > > >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 <[email protected]> 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 <[email protected]> >>To: R help <[email protected]> >>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]] >> >>______________________________________________ >>[email protected] 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]] ______________________________________________ [email protected] 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.
