[R] How to multiple the vector and variables from dataframe

[arun]

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 <laomeng_3 at 163.com>
To: R help <r-help at 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 



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