Add nan fail test#12
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xywei wants to merge 2 commits into
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Thanks! cc @isuruf |
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I think that Taylor expansions are okay because they are smooth. The issue pertains only to basis functions that are singular (like Bessel functions of the second kind). |
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Taylor multipoles aren't smooth though. (The multipole basis consists of derivatives of the kernel.) |
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If the expansion basis is singular at the origin, and a source point lies at the expansion center,
p2efails with NaNs.The added test shows that this is indeed an issue with
Y2DMultipoleExpansion.cf.