Re: [Numpy-discussion] [SciPy-User] Saving Complex Numbers
(CCing NumPy-discussion where this really belongs) On 2010-07-08, at 1:34 PM, cfrazer@uci.edu wrote:
Need Complex numbers in the saved file.
Ack, this has come up several times according to list archives and no one's been able to provide a real answer. It seems that there is nearly no formatting support for complex numbers in Python. for a single value, "{0.real:.18e}{0.imag:+.18e}".format(val) will get the job done, but because of the way numpy.savetxt creates its format string this isn't a trivial fix. Anyone else have ideas on how complex number format strings can be elegantly incorporated in savetxt? David
Thu, 15 Jul 2010 20:00:09 -0400, David Warde-Farley wrote:
(CCing NumPy-discussion where this really belongs)
On 2010-07-08, at 1:34 PM, cfrazer@uci.edu wrote:
Need Complex numbers in the saved file.
Ack, this has come up several times according to list archives and no one's been able to provide a real answer.
It seems that there is nearly no formatting support for complex numbers in Python. for a single value, "{0.real:.18e}{0.imag:+.18e}".format(val) will get the job done, but because of the way numpy.savetxt creates its format string this isn't a trivial fix.
Anyone else have ideas on how complex number format strings can be elegantly incorporated in savetxt?
The bug here is that >>> z = np.complex64(1+2j) >>> '%.18e' % z '1.000000000000000000e+00' >>> float(np.complex64(1+2j)) 1.0 This should raise an exception. I guess the culprit is at scalarmathmodule.c.src:1023. It should at least be changed to raise a ComplexWarning, which we now anyway do in casting. -- Pauli Virtanen
participants (2)
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David Warde-Farley -
Pauli Virtanen