[R] Applying a function to all combinations of factors

From: Marc Belisle <marc.m.belisle_at_usherbrooke.ca>
Date: Thu 03 Mar 2005 - 04:16:12 EST


Is there a way to apply a function, say cor(), to each combination of some number of variables, and this, without using loops?

For example, I have day, hour, var1 and var2. How could I compute cor(var1,var2) for each day*hour combination and obtain a matrix with day, hour and the cor value for each combination?

Thanks for your time,

Marc



Marc Bélisle
Professeur adjoint
Chaire de recherche du Canada en écologie spatiale et en écologie du paysage Département de biologie
Université de Sherbrooke
2500 Boul. de l'Université
Sherbrooke, Québec
J1K 2R1 Canada

Tél: +1-819-821-8000 poste 1313
Fax: +1-819-821-8049
Courriél: Marc.M.Belisle@USherbrooke.ca

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