[R] is.empty for formal class object
smyth at wehi.edu.au
Sat Mar 1 02:21:03 CET 2003
I'd like to construct a function is.empty(x) which would work on arbitrary
objects, and would tell me whether the object contains any data. I think
that I can write a function which will recurse down through all the slots
of x (and slots of slots) until it reaches objects of elementary type
(NULL, character, numeric, logical, matrix, function, data.frame and
possibly others) and then tests for length zero or nullness.
But does such a function already exist? Or is there a cleverer or more
direct way to do it?
I've looked through the online help for the methods package, and I've done
a keyword search through the R help for "empty" without finding something
that looks relevant.
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