On 8. mai 2011, at 17.32, Warren Weckesser wrote: > > > On Sun, May 8, 2011 at 7:23 PM, Charles R Harris <charlesr.har...@gmail.com> > wrote: > > > On Sun, May 8, 2011 at 3:15 PM, Paul Anton Letnes > <paul.anton.let...@gmail.com> wrote: > Hi, > > it seems that I have found a bug in numpy.ndarray. numpy 1.5.1, python 2.7.1 > from macports on mac os x 10.6.7. I got the same error on Fedora 14 with > numpy 1.4.1 and python 2.7. Appending a [0] to the last line solves the > problem. > > % python testcrash.py > > [14:13:27 on 11-05-08] > <type 'numpy.ndarray'> [ 12.+0.1j] > <type 'numpy.ndarray'> [ 1.+0.1j] > complex128 > Traceback (most recent call last): > File "testcrash.py", line 11, in <module> > A[0] = A[0] + (eps1 - eps2) > TypeError: can't convert complex to float > > % cat testcrash.py > #!/usr/bin/env python > > import numpy > > A = numpy.zeros(10, dtype=numpy.complex128) > eps1 = numpy.complex128([12.0 + 0.1j]) > eps2 = numpy.complex128([1.0 + 0.1j]) > > It's the brackets, numpy.complex128([1.0 + 0.1j]) is a 1d array, not a > scalar. The error message is less than helpful though. > > > > But the same pattern works fine with float64: > > In [2]: x = array([1.0, 2.0]) > > In [3]: y = array([10.0]) > > In [4]: x[0] = y # Works > > In [5]: a = array([1.0, 2.0], dtype=complex128) > > In [6]: b = array([10.0 + 1j]) > > In [7]: a[0] = b # Error > --------------------------------------------------------------------------- > TypeError Traceback (most recent call last) > > /Users/warren/<ipython console> in <module>() > > TypeError: can't convert complex to float > > > Something is fishy about that. > I agree. One thing is if arrays don't support this kind of assignment, but behavior should be the same for complex and float. IMHO.
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