Hello,
I suppose this is a basic question but couldn't find a solution.:
I have a large matrix with let say 3 columns:
V1 V2 V3
a x 2
a x 4
a y 8
b z 16
and I want to compute some statistics based on
the levels resulting form the
?tapply
?aggregate
You probably have a data frame, not a matrix.
Marc Mamin wrote:
I suppose this is a basic question but couldn't find a solution.:
I have a large matrix with let say 3 columns:
V1 V2 V3
a x 2
a x 4
a y 8
b z 16
and I
Marc Mamin wrote:
Hello,
I suppose this is a basic question but couldn't find a solution.:
I have a large matrix with let say 3 columns:
V1 V2 V3
a x 2
a x 4
a y 8
b z 16
and I want to compute some statistics based on
the levels resulting
