st: RE: nlsur command for a six commodity demand system

["Brian P. Poi" <brian@poiholdings.com>]

Dear Stata Users,
I'm trying to estimate a quadratic demand system of six equations but the
function evaluator program I wrote is not working.  When I try to run
the nlsur regression, Stata generates an error message (nlsuryonquaid
returned 109-verify that nlsuryonquaid is a function evaluator program). 
 
Below is the function evaluator program I wrote and I would appreciate it
very much if somone can help me figure out what the problem is.
Thanks,
Yonas
 
program nlsuryonquaid
  version 11
  syntax varlist(min=12 max=12) if, at(name)
  tokenize `varlist'
  args w1 w2 w3 w4 w5 lnp1 lnp2 lnp3 lnp4 lnp5 lnp6 lnexp
  tempname a1 a2 a3 a4 a5 a6
  scalar `a1' = `at' [1,1]
  scalar `a2' = `at' [1,2]
  scalar `a3' = `at' [1,3]
  scalar `a4' = `at' [1,4]
  scalar `a5' = `at' [1,5]

...

--------------------------

The space between the matrix name and the left bracket in your scalar
definitions could be the source of the r(109) errors.  When subscripting a
matrix, you can't have a space between the name and the subscript:

. mat b = (1,2,3)

. sca a = b [1,3]
type mismatch
r(109);

I'd try removing the spaces between `at' and the left bracket in all your
-scalar- statements.  IE, write

   scalar `a1' = `at'[1,1]

and so on instead of

   scalar `a1' = `at' [1,1]		// sic, not valid


   -- Brian Poi
   -- brian@poiholdings.com




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