@vectorize_2arg should use broadcast

[stevengj]

It seems like the @vectorize_2arg macro should really be broadcasting.

e.g. I expected this to work and be equivalent to broadcast(atan2, y, x):

y = linspace(-1,1,50)
x = y'
theta = atan2(y, x)

but it gives ERROR: argument dimensions must match.

[ViralBShah]

Ah yes, those functions were written much before the broadcasting implementation.

+1

[ViralBShah]

This didn't get closed for some reason from the github comment, it seems. Closing it.

[ViralBShah]

Oops - that is on a branch. I see the incorrect result type issue is still open, which is holding this.

[omus]

Looks like this should be closed.