Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: RE: submatrix, Thanks Nick!


From   behailu ayele <bbezabih@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: submatrix, Thanks Nick!
Date   Tue, 15 Nov 2011 12:59:07 +0000

Nick,

Many thanks. It worked. I have brilliant looking submatrices now!
behailu

On 11/15/11, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> Use Mata: e.g.
>
> : y = (1::81)
>
> : y2 = rowshape(y,9)
>
> : y2
>         1    2    3    4    5    6    7    8    9
>     +----------------------------------------------+
>   1 |   1    2    3    4    5    6    7    8    9  |
>   2 |  10   11   12   13   14   15   16   17   18  |
>   3 |  19   20   21   22   23   24   25   26   27  |
>   4 |  28   29   30   31   32   33   34   35   36  |
>   5 |  37   38   39   40   41   42   43   44   45  |
>   6 |  46   47   48   49   50   51   52   53   54  |
>   7 |  55   56   57   58   59   60   61   62   63  |
>   8 |  64   65   66   67   68   69   70   71   72  |
>   9 |  73   74   75   76   77   78   79   80   81  |
>     +----------------------------------------------+
>
> Nick
> n.j.cox@durham.ac.uk
>
> behailu ayele
>
> 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?
>
> 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.
>
> behailu ayele
>
>> 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]
>>
>
> *
> *   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/
>
*
*   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/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index