Python numpy array concatenation

Question

I have a doubt in numpy array concatenation.

For eg,

If I have

a = [ 1, 2, 3]
b = [4, 5, 6, 7]
c= [5, 2]

Could I concatenate arrays of different size??? If so, How could it be possible?

When you say "concatenate", do you mean you want the result to be [1, 2, 3, 4, 5, 6, 7, 5, 2], or do you want to create something like a jagged array using a, b and c for the rows (so the rows have different lengths)? It would help if you could put that information in the question. — Warren Weckesser
– Warren Weckesser, Commented Jan 12, 2017 at 9:31
@WarrenWeckesser, No, I want the result to be: [1,2,3,\n,4,5,6,7\n,5,2] — Dhara
– Dhara, Commented Jan 12, 2017 at 10:18
Please add that, along with your comment to Ruhul Amin's answer, to the question. — Warren Weckesser
– Warren Weckesser, Commented Jan 12, 2017 at 10:28

Ruhul Amin · Accepted Answer · 2017-01-12 08:18:21Z

1

Yes, You can using numpy.concatenate

import numpy as np
a = [ 1, 2, 3]
b = [4, 5, 6, 7]
c= [5, 2]
d = np.concatenate((a, b, c))

answered Jan 12, 2017 at 8:18

Ruhul Amin

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2 Comments

Dhara Over a year ago

My problem is: I want to merge numpy array as a csv file. I used : np.savetxt("output-1.csv", final_array, fmt="%3.2f"). Since"final_array" contains rows of different sizes, it doesnot works

Dhara Over a year ago

I want the result to be: [1,2,3,\n,4,5,6,7\n,5,2]

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