methods on missing data

I have 2 >issues< concerning methods applied to missing data.
I think they're bugs, but who knows.

1. var(NA) returns

     Error in var(NA) : missing observations in cov/cor

var(NA, na.rm=T)

instead of NA. I expanded the summary-function to my.summary
including SDev, in order to use it with tapply, which crashes
in case of groups with no valid data.

2. is a similar problem. I use tapply with hist. On groups
without valid data it crashes, like hist(as.numeric(c(NA)))
returning

     Error in pretty(rx, n = nnb, min.n = 1) : x must be numeric

hist(as.numeric(c(NA)),breaks=c(1,2)) works, as it does not use "pretty".

I know these are very special cases, but unfortunately they kill the whole
process.

I can figure out some personal solution, but I hope for a professional one.

Hope this is kind of helpful.

Maciej



sysname "Linux"
release "2.4.4"
version "#1 SMP Wed May 2 20:47:43 CEST 2001"
nodename "lxnf"
machine "i686"
login "unknown"
user "hoffman"

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