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re: Re: st: Errors "out of range" for a simple Mata function


From   Christopher Baum <kit.baum@bc.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   re: Re: st: Errors "out of range" for a simple Mata function
Date   Wed, 21 Nov 2012 14:14:31 +0000

<>
Nick said

> I was elevating my personal preference only to use views for data that 
> won't change to an implication that you can't do it, which was
> incorrect.
> 
> Given
> 
> local macro generate
> local macro varlist
> local macro touse
> 
> as discussed to date in the thread
> 
> . mata : st_store(., "`generate'", "``touse''", rowsum(st_data(.,
> tokens("`varlist'"), "``touse''")))
> 
> is I think a complete solution.


This is a good illustration of the notion that you don't even need to write a Mata function to use it to complete a Stata task.
But I personally disagree, in my own preferences, with only using views for viewing unchanged data. In my work I do just the 
opposite-- I never use st_store, and always use view matrices to return results to Stata. When creating a single variable, as in this
example, it makes little difference, but I find the syntax much simpler to create a whole set of variables in Mata and return them
to Stata via a view matrix. Many tasks one might employ Mata for create a matrix result, and that can be mapped back onto a
set of Stata variables by merely mentioning the name of the view matrix. For an example, see the code of hprescott.ado on SSC.* 
No doubt something similar can be done with st_store, but I do not find it as straightforward.

Kit

* If you're using Stata 12, use -tsfilter hp- for the Hodrick-Prescott filter!

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                             An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
  An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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