On 21/01/2009, at 12:26 PM, Czerminski, Ryszard wrote:
Passing extra arguments to FUN=mean or median in apply
seems fine, but when FUN=min warnings are generated?
See below.
Any ideas why?
Best regards,
Ryszard
Ryszard Czerminski
AstraZeneca Pharmaceuticals LP
m
[,1] [,2]
[1,] 1 2
[2,] 3 NA
[3,] NA NA
apply(m, 1, median, na.rm=T)
[1] 1.5 3.0 NA
apply(m, 1, mean, na.rm=T)
[1] 1.5 3.0 NaN
apply(m, 1, min, na.rm=T)
[1] 1 3 Inf
Warning message:
In FUN(newX[, i], ...) : no non-missing arguments to min; returning
Inf
RTFM:
The minimum and maximum of a numeric empty set are '+Inf' and
'-Inf' (in this order!) which ensures _transitivity_, e.g.,
'min(x1, min(x2)) == min(x1, x2)'. For numeric 'x' 'max(x) ==
-Inf' and 'min(x) == +Inf' whenever 'length(x) == 0' (after
removing missing values if requested).
cheers,
Rolf Turner
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