<sup>L</sup><sub>M,K</sub>, where the D<sup>L</sup><sub>M,K</sub> are Wigner functions and &lambda;<sup>L</sup><sub>M,K</sub> are the possibly complex-valued coefficients. L is a nonnegative integer, and both M and K are integers between -L and L.
</p>
<pre class="matlab">
Sys.Potential = [2 0 0 0.3];                  % L=2, M=K=0 coefficient is 0.3
Sys.Potential = [2 0 0 0.3; 2 0 2 -0.1];      % two coefficients
</pre>

<p>
Since the overall potential must be real-valued, there is a symmetry relation betwe