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Re: st: st_numscalar to pass a calculation result from Mata to Stata


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: st_numscalar to pass a calculation result from Mata to Stata
Date   Fri, 29 Apr 2011 18:51:06 +0100

So, you should test whether precision has been lost by using a
non-default format such as %23.18f or %21x to display your scalar.

Nick

On Fri, Apr 29, 2011 at 6:24 PM, Amir Fekrazad <amir.fekrazad@gmail.com> wrote:
> I use a Mata function to do some matrix calculation and then pass the
> result to Stata using:
> st_numscalar("varName", varValue)
>
> and in my Stata code I use:
> scalar `varName' = varName
>
> to obtain the value passed from Mata.
>
> The problem is, is seems that some precision is lost through this
> transfer. For example, while the result of the Mata function
> (displayed in Mata environment) is 202.6188514, the value passed to
> Stata  (displayed in Stata environment) is 202.61885.
>
> I do not know if this is just the difference of displaying format in
> Mata or Stata, or actually some precision is lost. Any advice is
> appreciated.
>
>

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