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# st: RE: RE: create local from element of matrix e(b)

 From "Claire Kamp Dush" To , Subject st: RE: RE: create local from element of matrix e(b) Date Thu, 14 Oct 2010 13:29:18 -0400

```Thank you! The two line solution worked for me, and I can now continue on with my coding. I appreciate your time. Claire

________________________________

From: owner-statalist@hsphsun2.harvard.edu on behalf of Nick Cox
Sent: Thu 10/14/2010 1:17 PM
To: 'statalist@hsphsun2.harvard.edu'
Subject: st: RE: create local from element of matrix e(b)

I know of a two-line solution

mat b = e(b)
local bw = b[1,1]

and I too would be interested to hear of a shorter one.

Nick
n.j.cox@durham.ac.uk

Claire Kamp Dush

I am sure someone had to have asked this type of question before, but in my googling and searching of the statalist archive, I could not come across a clear answer.

I am trying to create a local that equals an element of matrix e(b) produced by Stata following xtreg, fe. In fact, I am trying to get the first element.

Here is what I did:

quietly xtreg mdepc wavedi mdis_coh, fe
. matrix list e(b)
e(b)[1,3]
wavedi   mdis_coh      _cons
y1  .24873096  .34650713  .83985765

. local dif = el(e(b), 1,1)
matrix operators that return matrices not allowed in this context
r(509);
. local dif = e(b)[1,1]
invalid syntax
r(198);
. gen dif = el(e(b), 1,1)
matrix operators that return matrices not allowed in this context
r(509);
. gen dif = e(b)[1,1]
matrix operators that return matrices not allowed in this context
r(509);

I would appreciate any advice - I am sure I am making a really obvious mistake.

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```