Information distance was all NaN #27
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Now oldDistance and distance give identical numerical results
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This is a long-standing bug that propagated NaN to all entries of information distance in new distx.c and distxy.c code, whereas the R code of oldDistance worked. Now new C code and old R code give numerically identical results.
The NaN obviously appeared when both columns (species) were zero and the sum of species was 0 leading to expression 0/0, and there was an idea (via Adist,Bdist) to fix this, but it was not implemented.