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What is the sign convention used in MATLABs fft routines?

Convention FFT MATLAB routines Used
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What is the sign convention used in MATLABs fft routines?

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The fft in MATLAB is defined as sum(x(i)*exp(-j*i*k/N)) and not sum(x(i)*exp(j*i*k/N)). The first version is traditionally used by engineers, the second version by mathematicians.

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