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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