elemental function versus loop over function

I have to perform a scalar function on each of the elements of a large
array. In general, for speed, does it matter much whether I loop over
the array or define an elemental function? One aspect of my problem is
that my array result depends not only on the input array, but on one or
two scalar inputs. So if I define an elemental function, before I can
call it with these arguments, my understanding is that I have to "blow
up" these scalars into constant-valued arrays of the same dimension as
my input array.

My preliminary assumption is that isn't worth doing this, and just
looping over the array is likely to be faster.

.

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