hi netters
Suppose I have a factor X, with 10 elements and 3 levels: A B B C A C B A C
C .
It is easy to count the number of elements for each level:
tapply(X,X,length).
Now I have another factor Y, which formed a matrix with X:
X| A B B C A C B A C C
Y| B B C C C A A A B B
I wanna count the number of elements for each of these conditions: when X=A
and Y=A; when X=A and Y=B; when X=A and Y=C; when X=B and Y=A; when X=B and
Y=B; when X=B and Y=C; when X=C and Y=A; when X=C and Y=B; when X=C and
Y=C.
The code I have written for this task is too complicated, involving a lot
of for loops and if conditions. I believe there's some nice code that can
do it far more efficiently. Can anyone give me a hint?
Thanks a lot!
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
