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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 14:15:42 +0100

. 
. 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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