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Re: st: RE: submatrix


From   behailu ayele <bbezabih@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: submatrix
Date   Tue, 15 Nov 2011 11:20:25 +0000

Dear Nick and Statalisters,

Is there anyway, then, I can actually restructure my initial matrix in
a way that it has the dimensions I want (9 by 9) instead of one single
row?

Many thanks

Behailu

On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> Yes; Stata can only regard it as an error if you refer to rows and/or
> columns that don't exist.
>
> Nick
> n.j.cox@durham.ac.uk
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of behailu ayele
> Sent: 15 November 2011 10:56
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: RE: submatrix
>
> Nick,
>
> 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.
>
> behailu
>
>
> On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> 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
>> n.j.cox@durham.ac.uk
>>
>> 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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