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RE: st: Matrix help


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Matrix help
Date   Wed, 21 May 2008 14:38:26 +0100

. 
Following the link at the bottom of the help to -help matmacfunc- leads
you to the answer you seek. 

sysuse auto, clear
regress mpg weight price
local rownames : rownames e(V) 
di "`rownames'"

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

Data Analytics Corp.

But doesn't

matrix rownames 

set and reset the names?  I want to retrieve them and use them as a 
variable in a new matrix that I want to append to yet another matrix.

Nick Cox wrote:
> . 
> . help matrix rownames 
>
> Nick
> n.j.cox@durham.ac.uk 
>
> Data Analytics Corp.
>
> I used the mat_rapp command this morning - worked perfectly, and saved

> me time.  I have another question, if I may.  How do you retrieve the 
> row names and use them in the matrix M=J(n,m,value) command?  Any 
> examples of retrieving the names from, say, e(TR)?
>
> Sergiy Radyakin wrote:
>   
>> matrix M=J(n,m,value) will create a matrix size nxm filled with value
>>     
> "value".
>   
>> you will need it to create the column identifying source.
>>
>> mat_capp M : M1 M2 will stitch two matrices together taking columns
>> from M1 then from M2 and storing them in M. You will need it to put
>> the id-column into your matrices
>>
>> mat_rapp M : M1 M2 will stitch two matrices together taking rows from
>> M1 them from M2 and storing them in M. . You will need it to combine
>> e(TR) and e(TC).
>>
>> net search matrix save
>> will return a number of commands to export matrices. choose one that
>> produces output in a suitable format.
>>     
>
>   
>> On 5/20/08, Data Analytics Corp. <dataanalytics@earthlink.net> wrote:
>>     
>
>   
>>> I just ran a simple correspondence analysis and I would now like to
>>>       
> export
>   
>>> the coordinates to another program  In particular, I'd like to stack
>>>       
> the two
>   
>>> matrices of coordinates contained in e(TR) (which is R x J) and
e(TC)
>>>       
> (which
>   
>>> is C x J) into one matrix, add a column identifying the source (with
>>>       
> values
>   
>>> say, a 1 for e(TR) and 2 for e(TC)), resulting in an (R + C) x (j
+1)
>>> matrix, and then export the matrix, with rownames, to an ASCII
>>> comma-separated file.  Can this be done and how?

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