Why can't R understand if(num!=NA)?

I have a program, when I write

if(num!=NA)

it yields an error message.

it?
What is unclear about the error message?
However, if I write

if(is.na(num)==FALSE)

it works.

Why doesn't the first statement work?

Read section 2.5 'Missing values" of the manual "An Introduction to R".

Berend
Thanks,

Miao

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Why can't R understand if(num!=NA)?

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