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


From   Valérie Orozco <Valerie.Orozco@toulouse.inra.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: RE: define a matrix using its names of columns and rows
Date   Wed, 02 Aug 2006 14:11:22 +0200

Thank you Maarten. I have again learnt a useful command thanks to you!
valérie

*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

------------------------------------------------------------------------

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/
-----------------------------------------


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--

***********************
Valérie 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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