Message-ID: <9153c6$71a8hp@ironport10.mayo.edu>
Date: 2017-06-14T13:02:52Z
From: Terry Therneau
Subject: spurious warning in ave()
Consider the following simple data set and a call to ave:
> tdata <- data.frame(f1=c(1,1,1,1,2,2,2,2), f2=c(1,2,1,2,1,1,1,1), y=1:8)
> with(tdata, table(f1, f2))
f2
f1 1 2
1 2 2
2 4 0
> with(tdata, ave(y, f1, f2, FUN=max))
[1] 3 4 3 4 8 8 8 8
Warning message:
In FUN(X[[i]], ...) : no non-missing arguments to max; returning -Inf
There are no missing values in the result. The fact that ave() apparently tried to find
the max for a combination it did not need is irrelvant to the user, and the warning is
counterproductive.
Terry T.