Discussion of symmetry of DDA results in the manual

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Results computed by ADDA should possess certain symmetries imposed by general 
light scattering theories (see, e.g. book by van de Hulst, 1981). This includes 
reciprocal configurations, exact forward and backscatering, etc. 

The question is whether this symmetry should be perfect, or whether the 
difference can be used to judge overall accuracy of the DDA. The answer depends 
on the used polarizability formulation and accuracy of the iterative solver. A 
discussion of these issues should be added to the manual, similarly as is now 
done for different ways to calculate cross section in Section 9.3 "How to 
calculate scattering quantities".

Original issue reported on code.google.com by yurkin on 22 Mar 2012 at 5:18

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A relevant paper is 
Schmidt K., Yurkin M.A., and Kahnert M. A case study on the reciprocity in 
light scattering computations. Opt. Express 20, 23253–23274 (2012).
http://dx.doi.org/10.1364/OE.20.023253

In particular, it is shown that reciprocity condition is in most cases 
automatically satisfied for the DDA results, and it is not a measure of the 
accuracy of these results (as compared to a reference).

Original comment by yurkin on 2 Oct 2012 at 6:07

• Added labels: Milestone-1.2

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Corresponding discussion was added to the end of Section 9.3

Original comment by yurkin on 2 Oct 2012 at 6:23

• Changed state: Fixed