pc(c) prints the complex number c.
m2(c) returns the real square of the magnitude of the complex number c.
rnd() returns one real from a normal distribution with mean 0 and variance 1. Each value is independent of the other values. See rnd.c.
For a single precision array of complex numbers, a, fft(a, n) forms the discrete Fourier transform which displaces the contents of a.
The array size n must be a power of 2.
If a'[j] is the array content after the call then
a'[j] = Σ[0 ≤ k < 2n] ekji2π 2−na[k]. See more here. See fft.c.