Adaptive integration for truncated octahedron#710
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…sasmodels into ticket-535-adaptive-integration
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Modified the truncated octahedron function to use simple adaptive integration. Applies after #658
I reordered the axes for speed and accuracy, and adjusted the equations to minimize computation.
Note that the formula is suspicious since the limit as q -> 0 diverges. However setting t=1 (no truncation) and simplifying, the form matches that in 1, Appendix A, which also diverges. This cites 2, but I don't have access to verify the original derivation.
Wei-Ren Chen et al. "Scattering functions of Platonic solids".
In: Journal of Applied Crystallography - J APPL CRYST 44 (June 2011).
DOI: 10.1107/S0021889811011691
Stokes, A. R. & Wilson, A. J. C. (1942). Math. Proc. Camb. Philos.
Soc. 38, 313–322. https://doi.org/10.1017/S0305004100021988