Updates:
Cc: ondrej.c...@gmail.com
Comment #3 on issue 2423 by ondrej.c...@gmail.com: Rotation.d function
incorrect evaluation
http://code.google.com/p/sympy/issues/detail?id=2423
Looking at the table 4.14 in Varshalovich, the values for beta=pi/2 are
correct.
There are no tables for -pi/2, so I'll just write the result using
general "beta", from table 4.4.:
d(1, 0, 1, beta) = sin(beta)/sqrt(2)
d(1, 1, 0, beta) = -sin(beta)/sqrt(2)
For beta=pi/2, we get
d(1, 0, 1, pi/2) = sin(pi/2)/sqrt(2) = 1/sqrt(2)
d(1, 1, 0, pi/2) = -sin(pi/2)/sqrt(2) = -1/sqrt(2)
For beta=-pi/2, we get
d(1, 0, 1, -pi/2) = sin(-pi/2)/sqrt(2) = -1/sqrt(2)
d(1, 1, 0, -pi/2) = -sin(-pi/2)/sqrt(2) = 1/sqrt(2)
so indeed, the results for pi/2 are correct, but the results for -pi/2 have
incorrect sign. So we just need to fix the method, that generates it.
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