iPhone Accelerate Framework FFT vs Matlab FFT

Question

I do not have much math background but part of the project I am working on requires the FFT of a single vector. The matlab function fft(x) works accurately for what I need,

Answer 1

I think it could also be an array packing issue. I have just been looking at their sample code, and I see they keep calling conversion routines like

vDSP_ctoz

Here is the code sample link from apple: http://developer.apple.com/library/ios/#documentation/Performance/Conceptual/vDSP_Programming_Guide/SampleCode/SampleCode.html#//apple_ref/doc/uid/TP40005147-CH205-CIAEJIGF

I dont think it is the full answer yet, but I also agree with Paul R.

By the way, just curiously if you go to Wolfram Alpha, they give a completely different answer for FFT{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}