Log Normal Function

For POTEntial=LOGNormal, a logrithmic function is used (W. Rieping, M. Habeck, and M. Nilges, 2005):

$$E_{NOE}^{class} = {\rm min}(ceil, S \ln( R/d ) )$$ (20.9)

where $S$ is the scale factor specified by the SCALe statement, and $d$ is specified by the ASSIgn statement:

$$\begin{eqnarray*} {\tt assign \quad <selection> \quad <selection> } \quad d \quad d_{minus} \quad d_{plus} \end{eqnarray*}$$

The distance $R$ is defined in Section 20.2.