[Numpy-discussion] bug is arr.real for byteswapped array
Sebastian Haase
haase at msg.ucsf.edu
Mon Aug 21 21:09:43 EDT 2006
Hi,
We just spend some time debugging some numpy image analysis code
where we finally noticed that our file was byte-swapped ;-).
Even though we got much crazier numbers,
the test below already shows one bug in the a.real.max() line.
My numpy.__version__ is '1.0b3.dev3015' and this is run on pentium (little
endian) Linux (both 64bit and 32bit version give same results):
>>> a = N.arange(4, dtype='>c8')
>>> a
[ 0. +0.00000000e+00j 0. +1.00000000e+00j 0. +2.00000000e+00j
0. +3.00000000e+00j]
>>> a.max()
(3+0j)
>>> a.real.max()
0.0
>>> a.imag.max()
4.60060298822e-41
>>>
>>> a = N.arange(4, dtype='<c8')
>>> a.max()
(3+0j)
>>> a.real.max()
3.0
>>> a.imag.max()
0.0
>>>
Can someone test this on a newer SVN version ?
Thanks,
Sebastian Haase
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