Question for the HP guys....

[webmasterpdx]

I looked through the source code and from what I can tell, in maple.cc, if HP uses gcc and libgsl (Gnu Scientific Library), then they call the radix2 transform function.
Anyway, radix 4 speed increases are only significant when a large number of data elements are being used and since we are talking about a calculator, it's doubtful if large numbers of data elements are going to be used in fft's. Thus the advantage of a radix-4 would be minimal in any case.
Good 'nuff... :-)
Thx
-Donald