without a reproducible sample, it is hard to tell, but I will give it a shot.
Maybe it's possible to merge your M with M2: merge(M, M2)
If you only want to count times, you can use seq_along(x) in a by function
eg:
dat <- data.frame(person=rep(c(1,2,3), each=5), time=rnorm(15))
by(dat$person, dat$
On Wed, Feb 02, 2011 at 09:35:28AM +0200, Leendert Punt wrote:
> I have a 32000 x 14 matrix (M) where entry (x, y) corresponds to
> person x at a discrete time y. I then have a matrix (M2) of 6 x 2
> where each entry is a an event by a person that is in the above 32000
> and at a time that is i
I have a 32000 x 14 matrix (M) where entry (x, y) corresponds to
person x at a discrete time y. I then have a matrix (M2) of 6 x 2
where each entry is a an event by a person that is in the above 32000
and at a time that is in the range of the discrete time points above.
I want to populate the a
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