[R] Vector multiplication

[Peter Alspach]

Tena koe Kaspar

?outer

outer(b, a)
or
b %o% a

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Kaspar Bernet
> Sent: Thursday, 18 March 2010 7:03 a.m.
> To: r-help at r-project.org
> Subject: [R] Vector multiplication
> 
> Hi,
> 
> this may sound stupid (and it probably is), but I can't seem to find
> out how to multiply each element of a vector with each element of
> another vector where the result would be a matrix of
> dim[length(vectorOne),length(vectorTwo)] without using loops.
> 
> example: if
> 
> a -> c(1,2,3)
> b -> c(4,5,6)
> 
> i'm looking for the operation that would yield:
> 
>     [,1] [,2] [,3]
> [1,]    4    8   12
> [2,]    5   10   15
> [3,]    6   12   18
> 
> any hints are greatly appreciated,
> kaspar
> 
> ---------------------------------------------
> kaspar bernet kbernet at student.ethz.ch
> stationsstrasse 32 8442 hettlingen
> tel 052 301 12 33 mobil 079 789 75 61
> 
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