[Numpy-discussion] numpy.arcsin strange behavior?
Poitras, Daniel
Daniel.Poitras at nrc-cnrc.gc.ca
Fri Jul 28 15:07:24 CDT 2006
Hello,
I tried different arcsin functions on a "complex" number (z=0.52+0j) and obtained
the following results:
cmath.asin(z) gives (0.54685095069594414+0j) #okay
-1j*log(1j*z+sqrt(1-z**2)) gives (0.54685095069594414+0j) #okay, by definition
numarray.arcsin(z) gives (0.54685095069594414+0j) #still okay
but
numpy.arcsin(z) gives (0.54685095069594414+0.54685095069594414j) #bug??
Is it a bug in numpy, or is there another explanation?
Thanks
Daniel Poitras
Ottawa
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