[Numpy-discussion] sqrt and divide
Stefan van der Walt
stefan at sun.ac.za
Tue Apr 11 22:47:14 CDT 2006
Hi all
Two quick questions regarding unintuitive numpy behaviour:
Why is the square root of -1 not equal to the square root of -1+0j?
In [5]: N.sqrt(-1.)
Out[5]: nan
In [6]: N.sqrt(-1.+0j)
Out[6]: 1j
Is there an easier way of dividing two scalars than using divide?
In [9]: N.divide(1.,0)
Out[9]: inf
(also
In [8]: N.divide(1,0)
Out[8]: 0
should probably ruturn inf / nan?)
Regards
Stéfan
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