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RE: st: RE: submatrix

From   Nick Cox <>
To   "''" <>
Subject   RE: st: RE: submatrix
Date   Tue, 15 Nov 2011 11:10:39 +0000

Yes; Stata can only regard it as an error if you refer to rows and/or columns that don't exist. 


-----Original Message-----
From: [] On Behalf Of behailu ayele
Sent: 15 November 2011 10:56
Subject: Re: st: RE: submatrix


Thanks very much. I now went to matrix extraction and I think know my
problem, now. My estimation result reads only as row. Whatever I want
to extract,, it works when I specify as one row and any number of
columns. What I mean is, it works when I do either of these:

matrix A = b[1, "b1".."b9"]

matrix A = b[1, "a1".."a9"]

but it says conformability error whenever I do

matrix A = b[1..2, "a1".."a9"]

I am thinking I need to restructure my estimation result such that it
is a proper matrix to begin with (with 9 by 9 dimension) and not just
a matrix with one row and several columns.

Thankyou again.


On 11/15/11, Nick Cox <> wrote:
> This is covered by the help on -matrix extraction-
> matrix new = b[1..9, 7..9]
> The = operator for assignment should be used (not ==).
> Nick
> behailu ayele
> I have problem extracting parts of a matrix I estimated.
> my matrix e(b) is  9 by 9. Now I want to extract the first line and I did
> this.
> matrix b=e(b)
> and then
>  matrix new==b[1,1..9]
> my problem is  when i want to have a 3 by 9 matrix of the last three columns
> is this not what I am supposed to do?
> matrix new==b[7/9,1..9]

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