expj              242 apps/fft/fft.cpp                 dft += expj((sign*2*kPi*k*n)/N) * x(A({Expr(k)}, args));
expj              248 apps/fft/fft.cpp         X(A({n}, args)) = sum(expj((sign*2*kPi*k*n)/N) * x(A({k}, args)));
expj              282 apps/fft/fft.cpp         W(n) = expj((sign * 2 * kPi * n) / N) * gain;