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# st: RE: RE: RE: RE: Accessing to a subvector of vector like

 From Nick Cox To "'statalist@hsphsun2.harvard.edu'" Subject st: RE: RE: RE: RE: Accessing to a subvector of vector like Date Mon, 6 Feb 2012 19:06:37 +0000

```I think you've changed the question.

Please show us the exact code you used and explain in what sense it is "not working". Otherwise my answer can only be a guess that you did something wrong.

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

Nakelse, Tebila (AfricaRice)

Thank you Nick
I tried this solution.  But it still not working.
I want to use expression(pnl_exp) in margins. But if I use this solution stata may not know whether this coefficients are from a estimation and may not  use this information to compute the matrix of covariance for example.

Nakelse, Tebila (AfricaRice)

Thank you Nick. It is okay.

Nick Cox

Just copy to a regular vector first:

sysuse auto
gen gpm = 1 / mpg
regress gpm  weight length displacement

. mat li e(b)

e(b)[1,4]
weight        length  displacement         _cons
y1     .00001174     .00006458     5.517e-06     .00152916

. mat b = e(b)

. mat b1 = b[1, "weight".. "length"]

. mat li b1

b1[1,2]
weight     length
y1  .00001174  .00006458

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

Nakelse, Tebila (AfricaRice)

I would like to access to a subvector of a vector like e(b) or e(V).
Stata allows to have et sub-element as _b[varname]. Is it possible to have _b[varlist] ?

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```