Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: RE: define a matrix using its names of columns and rows


From   "Maarten Buis" <M.Buis@fsw.vu.nl>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: define a matrix using its names of columns and rows
Date   Wed, 2 Aug 2006 13:54:05 +0200

Valérie Orozco asked:
> I have a matrix toto like
> 
> toto[3,2]
>     b1  b2
> a1   0   0
> a2   0   0
> a3   0   0
> 
> Does anyone know how I can use the names of columns and rows of the
> matrix to replace some elements.
> Instead of doing mat toto[2,1] = -1, I would to write "mat toto["a2",
> "b1"] = -1" (but this last one is wrong since I have the error  "type
> mismatch") ??? 


Valérie
You can do this with the -rownumb- and -colnumb- functions:
mat toto[rownumb(toto,"a2"),colnumb(toto, "b1")] = -1
HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------
 

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   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   |   What's new   |   Site index