numpy.loadtxt does not read file with complex numbers

Question

I am trying to read a file with complex numbers in the form :

data.dat

1.5795219122457646E-11-3.852906516379872E-15i   -3.5949335665378405E-12-1.626143709108086E-15i
-6.720365121161621E-15-5.377186331212649E-17i   -3.736251476362349E-15-3.0190920417856674E-17i

I use the following code to read the file :

import numpy as np

c_complex = np.loadtxt('data.dat', delimiter='\t', dtype=np.complex128)

But it gives me the following error :

TypeError: complex() argument must be a string or a number, not 'bytes'

What could I do to solve this problem ?

Thank you very much for your help

In which case this may be a bug in `numpy`, though I can't imagine something so basic going untested. The issue is, in Python 3 one can't pass a bytestring to `complex()` because text is no longer represented by bytestrings. It looks as though the file is being opened in binary mode by `loadtxt()`. — holdenweb, Sep 10 '15 at 09:48
If I use Python 2 the error is : ValueError: complex() arg is a malformed string — Anthony Lethuillier, Sep 10 '15 at 09:50

score 3 · Accepted Answer · answered Sep 10 '15 at 09:51

3

This seems to have been a bug in older versions of numpy (Issue). Either update your numpy to the latest version of their github repository or use the function numpy.genfromtxt().

c.complex = np.genfromtxt('data.dat', delimiter='\t', dtype=np.complex128)

answered Sep 10 '15 at 09:51

Dencrash

133
1
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c_complex , not c.complex which will throw an error – AAI Oct 04 '19 at 00:11

numpy.loadtxt does not read file with complex numbers

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