Re: cmplx(0.,-x) or -j*x

gh14tq5@xxxxxxxxx wrote:

Is there any speed advantage of using

z = cmplx(0,-x) over z = -j*x (or vice-versa) 

where x is real and possible an array and j=sqrt(-1). Would this be
something that is compiler dependent?


Well, the CMPLX version should pretty much just copy the data.  The
second one possibly will actually do multiplication.  I would hope an
optimizing compiler would figure it out, but I wouldn't guarantee it.

-- glen

.