Deprecate is_duplicate_entry?

[Rik]

3/2/11

John,

Can we deprecate this function?  It is a logical test of whether there are
any duplicates in a vector, but it only works on numeric vectors.  The
function unique.m is more versatile operating on vectors, cellstrs, and
with more options such as 'rows'.  Moreover, if is_duplicate_entry returns
true then one still has to go to the work of finding out what those
duplicates are which basically involves calling unique.m.  It seems like
the following code snippet would be more useful if anyone needs to test for
duplicates.

a = [big long vector];
b = unique (a);
is_duplicate_entry = numels (a) == numels (b);

Currently we are not using the function anywhere else in the codebase.

Cheers,
Rik