Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: RE: submatrix, Thanks Nick!
From
behailu ayele <[email protected]>
To
[email protected]
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 <[email protected]> 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
> [email protected]
>
> 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 <[email protected]> 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 <[email protected]> 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
>>> [email protected]
>>>
>>> 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/