[Rd] Inconsistent behavior of summary

[Kaiyin Zhong]

Here is the code:

summary(c(1:5, NA))
summary(c("a", NA))

It seems in the firs case the number of NAs is reported, but not in the
second.

Tested with R 3.3.1 on a mac.


Best regards,

Kaiyin ZHONG

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