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This function compute the WV (haar) of a Drift process
dr_to_wv(omega, tau)
A double corresponding to the slope of the drift
double
A vec containing the scales e.g. \(2^{\tau}\)
vec
A vec containing the wavelet variance of the drift.
The Drift (DR) process has a Haar Wavelet Variance given by: $$ \nu _j^2\left( {{\omega }} \right) = \frac{{\tau _j^2{\omega ^2}}}{{16}} $$