66 lines
2.4 KiB
ReStructuredText
66 lines
2.4 KiB
ReStructuredText
Known bugs
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===========
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Wrong factor on B coefficient (single coeff version)
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-----------------------------
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(Probably fixed in the "calculator object" versions!)
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Under Kristensson normalisation (with CS = -1), my code gives
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B(1,0,n,n)/B(1,0,n,-n) == -(2n)! at (x,y,z) = (x,0,0)
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(expected plus or minus 1).
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A-coefficients seem to behave correctly.
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BUT THE CSPHASE MIGHT BE WRONG ON BOTH SINGLE A AND B (TODO TEST)
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Xu's antinormalisation
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----------------------
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"Xu's antinormalisation" is broken (most likely in legendre.c and maybe
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also in qpms_types.h) – the plane wave test fails and the spherical wave
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reconstruction as well (but the translation coefficients match the
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Xu's tables).
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Longitudinal waves
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------------------
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Plane wave decompositions gives wrong value on the longitudinal part.
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The implementation of the L coefficients OR the longitudinal waves
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is thus probably wrong.
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Scattering result asymmetry
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---------------------------
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The lattice scattering code (such as finitesqlatzsym-scattery.py) produces
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asymmetric results where one should not get them, due to the system symmetry.
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It seems that the asymmetry appears mostly in the y-direction (i.e.
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for example the scattering/absorption cross section at k = (kx, ky, kz)
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is not exactly the same as k = (kx, -ky, kz).
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What has been checked (hopefully):
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- The flip operators for electric waves
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- Some weird kind of rounding or other numerical error depending on
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the position ordering of the matrix (randomized indices give
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the same asymmetry).
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What has not been checked (so well):
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- The x,y,z-flip operators for magnetic waves (i.e. are they really
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supposet to bejust the
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same as the operators for electric waves, just with opposite sign?)
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- zplane_pq_y
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- the translation operators
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Singular value asymmetry
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------------------------
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Similar as the scattering result asymmetry, although not necessarily
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only in the y-direction?
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Overflows etc.
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--------------
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Assertion failed in gaunt_xu for test_vswf_translations.c and high values of LMAX
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(LMAX=25)
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Moreover, the non-normalized legendre functions that are used in translations.c
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are likely to overflow for even smaller values of l.
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Therefore TODO: modify translations.c in a way that uses normalised legendre functions everywhere.
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Memory management
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-----------------
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When compiled with optimizations, I get stack smashing error in qpms_trans_calculator_get_2DFT_longrange_AB_arrays().
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