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

[Val�rie Orozco <Valerie.Orozco@toulouse.inra.fr>]

Thank you Maarten. I have again learnt a useful command thanks to you!
val�rie

*From* 	  "Maarten Buis" <M.Buis@fsw.vu.nl <mailto:M.Buis@fsw.vu.nl>>
*To* 	  <statalist@hsphsun2.harvard.edu 
<mailto: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

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Val�rie 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") ??? 

Val�rie
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/
-----------------------------------------


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--

***********************
Val�rie Orozco
INRA ESR Toulouse - FRANCE
ESR INRA - BP52627 - 31326 Castanet Tolosan Cedex 
orozco@toulouse.inra.fr
05-61-28-50-97
***********************




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