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Re: st: Optional arguments in Mata


From   "Ben Jann" <ben.jann@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Optional arguments in Mata
Date   Tue, 2 Oct 2007 10:37:41 +0200

How about:

void myfunction(string scalar depvar, | string scalar varlist)
{
      st_view(y=.,.,depvar,.)
      if (args()<2) x = J(rows(y),0,.)
      else st_view(x=.,.,varlist,.)

      x=x,J(rows(x),1,1)

      x'*y
}

ben

On 10/1/07, Le Wang <statauser@gmail.com> wrote:
> Hi there,
>
> Thanks in advance for your time.
>
> I am trying to program a Mata function with optional arguments. For
> example,  I want to: (1) read the data y and x (2) create a matrix
> equals x and J(rows(x),1,1) (constant) (3) create a matrix x'*y
>
> void myfunction(string scalar depvar, | string scalar varlist)
> {
>       st_view(y=.,.,depvar,.)
>       st_view(x=.,.,varlist,.)
>
>       x=x,J(rows(x),1,1)
>
>       x'*y
> }
>
> The program will work fine if i specify the varlist
>         myfunction("y","x")
>
> However, it won't work if I don't specify the varlist because
> "st_view(x=.,.,varlist,.)" requires an argument. How should I solve
> this problem?
>
> Thanks.
>
> Le
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Le Wang, Ph.D.
> Minnesota Population Center
> University of Minnesota
> (o) 612-624-5818
> *
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