I am using numpy to prototype a FFT hw accelerator. And while I was debugging the base 2x2 case when I noticed something odd. Per every calculator I could find e^(-i * pi) is equal to -1. However when I have Numpy do np.exp(-1j*np.pi) it returns (-1-1.2246467991473532e-16j) I can't read this number but it doesn't look like -1 and when you add -1 to it it doesn't start looking like 0. Are the online calculators I am using here wrong? Or perhaps I am notating the math incorrectly? Continue reading...
