Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

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

 From Nick Cox <[email protected]> To "'[email protected]'" <[email protected]> Subject RE: st: RE: create local from element of matrix e(b) Date Thu, 14 Oct 2010 18:39:22 +0100

```Yes, good point, and I really should have remembered that.

Nick
[email protected]

Steve Samuels

This "feature" of e(b) is a continuing irritant, but in this case why not:

local bw = _b[wavedi]

On Thu, Oct 14, 2010 at 1:17 PM, Nick Cox <[email protected]> wrote:
> 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
> [email protected]
>
> 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.
>

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/
```