(method of ODF)
compute the axis distribution of an ODF or MDF
value = calcAxisDistribution(odf) adf = calcAxisDistribution(odf, a)
| odf | ODF orientation or misorientation distribution function | 
| a | vector3d rotational axis | 
| afd | S2Fun axis distribution function | 
| value | value of axis distribution function for rotational axis a | 
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