Hi,

i got a little question about the NA's in vectors and matrices. When I
want to do some operations on a matrix with some NA's it is possible
to stripp them before the computation proceed (by na.rm=TRUE).

But how can I stripp NA's when I want to proceed a 'if', 'for'
or 'while' string? Because when I don't stripp them I always reveive
the message :"missing value where TRUE/FALSE needed". I don't know if
I can use the method with na.rm=TRUE and if so, how I can do it.

Thanks a lot in advance!

Matthias Tips

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