# Re: [R] Forcing scalar multiplication.

From: Kjetil Halvorsen <kjetilbrinchmannhalvorsen_at_gmail.com>
Date: Fri, 25 Jun 2010 15:42:59 -0400

?sweep

On Fri, Jun 25, 2010 at 2:43 PM, <rkevinburton_at_charter.net> wrote:
> I am trying to check the results from an Eigen decomposition and I need to force a scalar multiplication. The fundamental equation is: Ax = lx. Where 'l' is the eigen value and x is the eigen vector corresponding to the eigenvalue. 'R' returns the eigenvalues as a vector (e <- eigen(A); e\$values). So in order to 'check' the result I would multiply the eigenvalues ('l') by the eigenvectors. But unless I do it one by one (say e\$values * e\$vectors[,1]) 'R' tries a matrix multiplication and that is not what I want.  I would like a matrix that is formed by the SCALAR multiplication of each of the values by the corresponding eigenvector. How can I force such a multiplication?
>
> Thank you.
>
> Kevin
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help