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st: basic quesion about using structures in mata


From   Matthew Weinberg <mweinber@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: basic quesion about using structures in mata
Date   Mon, 17 Sep 2007 15:17:19 -0400

I'm trying to use structures for the first time and am having a little trouble. I want the function markups to take three arguments (s,p,b) and return three arguments (margins, marks, and costs). I'm getting back one

My code is:

mata
struct mups{ /*define the structure*/
real matrix margins
real matrix marks
real matrix costs
}

struct mups function markups(s,p,b) /*define the function*/
{
struct mups scalar ms /*declare structure variable*/
n=rows(s)
S=J(n,n,0)
for(i=1;i<=n;i++){
for(j=1;j<=n;j++){
S[i,j]=-b*s[i]*s[j]
}
}
for(i=1;i<=n;i++){
S[i,i]=-b*s[i]*s[i]+b*s[i]
}
Omega=I(n)*S
ms.margins=invsym(Omega)*s
ms.costs=p-ms.margins
ms.marks=(p-ms.costs):/p
return(ms)
}
end

When I evaluate my function, I get back what something like 0x27c65c instead of the three vectors margins, costs, and marks. I'd really appreciate it if somebody could tell me what I'm doing wrong. Thanks, Matt
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