Re: st: beginer's mata function in dofile

[Nick Cox <njcoxstata@gmail.com>]

No. The hierarchy is that your program -nn- is defined before it is  
run. That defines the Mata function before that itself is run.

Nick

On 8 Aug 2012, at 16:22, tashi lama <ltashi32@hotmail.com> wrote:

> Thanx...that makes sense although the following do-file seems to  
> contradict(unless I am not seeing something). In the following do- 
> file, the mata function is called prior to it being defined. And it  
> works.
> //begin do-file mata1.do
> clear all
> set obs 10
> forvalues i=1/5 {
> g bp`i'=runiform()
> }
> capture program drop nn
> prog nn, rclass
> mata: do_trend_var("b", "bp1 bp2 bp3 bp4 bp5")
> list
> end
> version 12
> mata
> void function do_trend_var(string scalar newvarname, string scalar  
> varnames)
> {
> real matrix Y
> real colvector b
> real scalar idx
> st_view(Y,.,varnames)
> b=(1::rows(Y))
> idx=st_addvar("float",newvarname)
> st_store(.,idx,b)
> }
> end
> nn
>
> Thanx...
>
> ----------------------------------------
> > Date: Wed, 8 Aug 2012 12:40:34 +0200
> > Subject: Re: st: beginer's mata function in dofile
> > From: klein.daniel.81@googlemail.com
> > To: statalist@hsphsun2.harvard.edu
> >
> > Tashi,
> >
> > there is nothing I can really add to that statement. The critical
> > point is to define/compile the Mata function before you call it. This
> > do-file works, without a -program- being defined.
> >
> > m :
> > void myfunc(real scalar x)
> > {
> > x
> > }
> > end
> >
> > loc x 42
> > m : myfunc(`x')
> >
> > Best
> > Daniel
> >
> > --
> > The only thing I didn't follow is where you say... it is not  
> > necessary
> > to define a program that calls mata functions. Could you elaborate on
> > that?
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