UnivariateSpectralDensity.m must be implemented to preprocessor and documented.

The SpectralDensity option of stoch_simul is neither documented nor implemented in the preprocessor. It could be implemented as an option of stoch_simul().

Alternatively, we could use a preprocessor command along the lines

spectral_density_decomposition(plot=integer,cutoff=number,step_length= number);

which translates into

options_.SpectralDensity.trigger = 1; options_.SpectralDensity.plot = integer; options_.SpectralDensity.cutoff = number; options_.SpectralDensity.sdl = number;