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st: RE: Adding Matrices generated from a loop


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Adding Matrices generated from a loop
Date   Fri, 24 Aug 2007 13:53:45 +0100

There may be subtleties here I am missing, but 
I would initialise 

	sum <- first_matrix

and then loop over the other matrices

	sum <- sum + next_matrix

This is pseudocode. 

Otherwise I can't tell what's troubling you about
this. As the details will depend on whether 
you are using Stata or Mata, your naming structure, 
what else you are doing with these matrices, 
whether the number is predictable in advance, etc., 
none of which is indicated, I'll leave it there. 

Nick 
n.j.cox@durham.ac.uk 

Nadeem Shafique
 
> I want to add several matrices (say K) of the same order, suppose the
> matrices to be added are comming from a loop, how can i calculate the
> following
> 
>                 K
>                 Sum    X_i
>                 i=1
> where X_i is the ith Matix

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