[R] comparing row by row in matrix

Petra Steiner steinep at uni-muenster.de
Tue Mar 26 20:07:50 CET 2002


and thanks for the two responses to my questions on binary matrixes, which
showed me that the functions I needed do not exist.

To get a distance matrix with the Russell-Rao-coefficient, I first have to
compare each row of a binary matrix with each row and count how many
elements are
a. equal
b. 1.

f <- function(x,y) (sum(x == 1& y == x))

Now how can I iterate this over a matrix without a loop? I think apply etc.
will not work in this case.

Thanks for any help.


Petra Steiner
Arbeitsbereich Linguistik
Universitaet Muenster
Huefferstrasse 27
48149  Muenster

Tel: 0251 / 83 39442
petra at marley.uni-muenster.de

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