[R] product of successive rows

[Moshe Olshansky]

Assuming that the number of rows is even and that your matrix is A, element-wise product of pairs of rows can be calculated as

A[seq(1,nrow(A),by=2),]*A{seq(2,nrow(A),by=2),]


--- On Mon, 28/7/08, rcoder <mpdotbook at gmail.com> wrote:

> From: rcoder <mpdotbook at gmail.com>
> Subject: [R]  product of successive rows
> To: r-help at r-project.org
> Received: Monday, 28 July, 2008, 8:20 AM
> Hi everyone,
> 
> I want to perform an operation on a matrx that outputs the
> product of
> successive pairs of rows. For example: calculating the
> product between rows
> 1 & 2; 3 & 4; 5 & 6...etc.
> 
> Does anyone know of any readily available functions that
> can do this?
> 
> Thanks,
> 
> rcoder
> 
> 
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