Dear R-list,
 
i have a problem, in the framework of simulations, i want to vectorize for
earning time: a variable, say X, has values on intervals and an other
variable, say Y, has values on other intervals. For example
 
Inf     Sup     X
0     2     1
2     4    2
4     6    3
 
and 
 
Inf     Sup     Y
1     3     1
3     5    2
5     7    3
 
i want to create a matrix like this
 
Inf     Sup     X     Y
0     1       1     NA
1     2      1     1
2     3      2     1
3     4      2     2
4     5      3     2
5     6      3     3
6     7      NA     3
 
I get it with loops but it seems to me that it can take a lot of time for a
large number of intervals. I cannot get it with some matrix or vector
manipulation (quicker than loops). Any solution???
 
thank you in advance, with my best regards, erik.
 
=================================
Erik-André SAULEAU MD, PhD
 
SEAIM
Centre hospitalier
87, Avenue d'Altkirch
BP 1070
F-68051 Mulhouse Cédex
Tel: (0033)389646753
Mel: sauleauea@ch-mulhouse.fr <mailto:sauleauea@ch-mulhouse.fr> 
Web: www.ch-mulhouse.fr <http://www.ch-mulhouse.fr/> 
=================================
Registre des Cancers du Haut-Rhin
9, Rue du Dr Mangeney
BP 1370
F-68070 Mulhouse Cédex
Tel: (0033)389646251
Web: www.arer68.org <http://www.arer68.org/> 
=================================
 
 


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