The function hgm.Rhgm.demo1 performs a demonstration of the function hgm.Rhgm.
The function hgm.Rhgm.demo1 evaluates the normalizing constant of the Von-Mises distribution by the HGM.
The returned value is a dataframe. The column exact of the dataframe is the exact value of the normalizing constant. The column byHGM is the value obtained by the HGM. The column start is the initial value for the HGM.