Write ndarray as binary and read with correct shape

Question

I have an N by 6 by f numpy array. I would like to be able to write this as a binary file and then read it by another python script into an array of the same dimensions.

To test this, I do the following (based on this question):

import numpy as np

farray=np.array([[3.14, 2.7, 0.0, -1.0, 1.1],[3.14, 2.7, 0.0, -1.0, 1.1]])
testf = open('test','wb')
farray.tofile(testf)
testf.close()

arraytest = np.fromfile('test')

At which point arraytest.shape is (10,). How can I make sure it is (2,5) instead without having to know 2 and 5 in advance to reshape the array? Can I somehow encode this information in the binary file as you would do with \n in a regular text file?

Manoj Mohan · Accepted Answer · 2019-03-12 18:22:12Z

3

Why not use np.save & np.load?

import numpy as np
farray=np.array([[3.14, 2.7, 0.0, -1.0, 1.1],[3.14, 2.7, 0.0, -1.0, 1.1]])
np.save('nums.npy', farray)
loaded_farray = np.load('nums.npy')
print(loaded_farray)

[[ 3.14 2.7 0. -1. 1.1 ] [ 3.14 2.7 0. -1. 1.1 ]]

answered Mar 12, 2019 at 18:22

Manoj Mohan

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