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RE: st: Mata in an rclass program to bootstrap

From   "Nelson, Carl" <>
To   "" <>
Subject   RE: st: Mata in an rclass program to bootstrap
Date   Sun, 19 Jul 2009 10:37:23 -0500


Thank you very much for your help.
I was unaware of argument passing through string scalar when passing a matrix with st_matrix.
This is very helpful information.

From: [] On Behalf Of Maarten buis []
Sent: Sunday, July 19, 2009 8:52 AM
To: stata list
Subject: RE: st: Mata in an rclass program to bootstrap

--- Nelson, Carl wrote:
> Is there a proper way to embed mata in a program to bootstrap
> that will not create this error?

Here is a silly example. More general advise can be found
here: -help m1_ado-

*-------------- begin example ------------
mata: mata clear
sysuse auto, clear

void foo(string scalar b) {
        bb =st_matrix(b)
        bb = 2:*bb
        st_matrix("b", bb)

program drop _all
program define silly, rclass
        reg mpg foreign
        matrix b = e(b)
        mata: foo("b")
        return scalar b1 = el(b,1,1)
        return scalar b2 = el(b,1,2)
bootstrap b1=r(b1) b2=r(b2), reps(100): silly
*-------------- end example -----------------

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen

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