sobol.R computes Sobol sequences but not using Gray code so points are
not in the same order as in sobol.
sobol.basic compute the Sobol sequence in one dimension according to a primitive
polynomial and specified integers \(m_j\).
int2bit computes the binary representation of the integer part of a real,
bit2int computes an integer from its binary representation.
bit2unitreal computes the radical inverse function in base 2.