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st: cholesky decomposition

From   Narasimhan Sowmyanarayanan <>
Subject   st: cholesky decomposition
Date   Wed, 3 Nov 2010 15:54:24 -0400

I am trying to do the cholesky decomposition of the vce matrix in
stata and am finding that it says its not positive definite. After
running the regression I specify

reg x y z
matrix v = e(vce)
matrix c = cholesky(v)

I get the following error:

"cholesky(): matrix has missing values"

I checked the help in stata and it says that I can use _cholesky()
option. But if I try that then I get the following

. matrix c = _cholesky(v)
unknown function _cholesky()

I was wondering if I am doing something wrong ? Some insights will be
highly appreciated from the knowledgeable members.

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