[R] multiply two matrixes with the different dimension column by column

[Alex Brown]

apply(Y, 2, function(y)list(y*X))

On 13 Oct 2006, at 12:33, Majid Iravani wrote:

> Dear all,
> I would like to multiply two matrixes with the different dimension  
> column
> by column. Let make an example:
> If I have two matrixes "X" and "Y"as follow:
>
> X<- matrix(1:12, nrow=4, ncol=3, dimnames=list(c("A","B","C","D"),
> c("stage1","stage2","stage3")))
> Y<- matrix(1:28, nrow=4, ncol=7, dimnames=list(c("A","B","C","D"),
> c("site1","site2","site3","site4","site5", "site6","site7")))
>
>   I would like to multiply first column of the "Y"matrix (site1) to  
> the all
> of the columns in "X"matrix. Then, the product will be three new  
> columns
> (for example:site1stage1, site1stage2 and site1stage3 or something  
> like
> this) which I want to add to "Y"matrix. As my site (Y) dataset has  
> too many
> columns, it's not easy to do it in Excel and I'm looking for a  
> command in R
> to prepare a new data frame for more analysis. So I would greatly
> appreciate if anybody can help me in this case.
> Thanks in advance
> Majid
> ---------------------------------------------------------------------- 
> ----------
>   Majid Iravani
>   PhD Student
>   Swiss Federal Research Institute WSL
>   Research Group of Vegetation Ecology
>   Zürcherstrasse 111  CH-8903 Birmensdorf  Switzerland
>   Phone: +41-1-739-2693
>   Fax: +41-1-739-2215
>   Email: Majid.iravani at wsl.ch
> http://www.wsl.ch/staff/majid.iravani/
>
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