[R] tapply on a matrix?
Jon McAuliffe
jon at mcauliffe.com
Sat Apr 21 00:21:53 CEST 2001
suppose i have an nx2 matrix A; call its column vectors
x and y. the rows of A are grouped by a factor F. i want to fit
one lowess curve (y vs. x) for each subset of rows corresponding
to a particular level of F. naively, i mean something like
tapply(A, F, fun = lowess) ,
but tapply needs A to be 1-dimensional. reading the help pages,
the other {,l,s}apply functions seem not to be germane in this
situation either. what's the correct approach here?
many thanks
jon.
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