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Re: st: On calling a mata-defined function in Stata


From   Dorothy Bridges <dbstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: On calling a mata-defined function in Stata
Date   Wed, 11 May 2011 23:35:12 -0700

Thanks very much!

On Wed, May 11, 2011 at 9:04 AM, Austin Nichols <austinnichols@gmail.com> wrote:
> Dorothy Bridges <dbstata@gmail.com>:
> I guess you refer to
> http://www.stata.com/statalist/archive/2009-04/msg00976.html
> which is worth referencing as it contains a lot of material.
>
> Mata is more elegant for more difficult problems, but try:
>
> clear all
> mata:function f(x) return(x^2+2*x)
> sca x=5
> mata:st_numscalar("y",f(st_numscalar("x")))
> di x,y
>
>
> On Wed, May 11, 2011 at 10:19 AM, Dorothy Bridges <dbstata@gmail.com> wrote:
>> I found in the archives the following comment regarding calling a
>> function in Stata: "or you can write a Mata function which you call
>> from Stata ... [which] is often more elegant."  I've tried
>> unsuccessfully to find instructions on how exactly to go about this.
>> What I'd like to do, I think, is:
>>
>> Mata:
>> function f(x) return(x^2+2x)
>>
>> In Stata
>> sca x=5
>> sca y=&f(x)
>>
>> But, clearly, I don't know what I'm doing.  Many thanks in advance.
>
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