Ellipses when converting list of numpy arrays to string in python 3

Question

I have a list of numpy arrays. I want to convert the list of arrays to a string. So that there will be a long string of arrays like '[ stuff ], [ stuff2 ]', etc. Each array has 192 elements. Conversion works when I do str(myList) if the list has 5 arrays or less. If it has 6 arrays, I get back truncated arrays with ellipses. Why is this? How can I stop it?.

I have examined the arrays themselves and they do not in fact contain ellipses, they contain the correct values.

I further looked into it and if I do something like str(myList[0:5]) it works on the first 5 arrays, but that 6th array always goes to ellipses. Note that this is not just ellipses when printing to screen either, I'm saving this variable and when I look at the saved text it has the ellipses.

Sounds like your list of arrays is really a 2d array. numpy uses ellipses when arrays get larger than a 1000 elements (hence the 5 v 6). If it was really a list of arrays, it would format each one independently, and not use ellipses. — hpaulj
– hpaulj, Commented Sep 27, 2015 at 16:28

Rory Yorke · Accepted Answer · 2015-09-27 07:43:17Z

4

From a quick look, the only way is to use numpy.set_printoptions:

import numpy as np

a = np.random.randint(5, size=(6, 192))
s1 = str(a)
np.set_printoptions(threshold = np.prod(a.shape))
s2 = str(a)

print('...' in s1)
print('...' in s2)

gives

True
False

on my Ubuntu 14.04 system, Python 2.7, Numpy 1.8.2

I would restore the default to 1000 after changing it, and, in my opinion, the function numpy.array2string should have a threshold argument.

answered Sep 27, 2015 at 7:43

Rory Yorke

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