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st: RE: define a matrix using its names of columns and rows
Thank you Maarten. I have again learnt a useful command thanks to you!
val�rie
*From* "Maarten Buis" <[email protected] <mailto:[email protected]>>
*To* <[email protected]
<mailto:[email protected]>>
*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
[email protected]
05-61-28-50-97
***********************
*
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* http://www.ats.ucla.edu/stat/stata/
