zero-phasing frequency components while keeping the same magnitude, in Matlab
it is obvious that abs(real(fft(x)))!=abs(fft(x)) since you are removing the imaginary part while taking the real function.One way if you want a signal with all dft components being real.Is to normal to just take abs(fft(x)) as the spectrum itself rather than taking the real components.In this you maintain the magnitude and all the components have zero phase.I hope this answers your question