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pythonarraysnumpy
Leon palafox
Leon palafox

Reputation: 2785

What is the best way to dynamically increase a numpy array in Python?

Say we have an incoming stream of data of size (1,N), it is a numpy array

read_data = [[foo, foo_1, foo_2]]

And we want to do something with that or simply append it to a larger array.

data=np.vstack((data,real_data)) (or whatever method you choose)

My trouble usually comes in the fact that I do not know the dimensions of the incoming data, so what I sometimes do, is:

In matlab this is very easy, since it dynamically creates the array you need as soon as you give data (although is not recommended to do)

What is the best way to do it in python?

Upvotes: 5

Views: 6510

Answers (1)

Jblasco
Jblasco

Reputation: 3967

I think a good option is: 

import numpy
first_array = numpy.array([1,2,3])
new_array = numpy.append(first_array, [4,5,6])
print new_array

And the output is: [1 2 3 4 5 6]

Upvotes: 2

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