Building An Nxn Matrix In Python Numpy, For Any N

Is it possible using numpy for python (versions 3.3) to write the code for building an nxn matrix, without specifying n? I need to index the entries as A_i,j or something like that

Solution 1:

You can create an empty nxn array:

import itertools
import numpy as npmy_array= np.empty([n, n])

Then set the value at coordinate i, j to f(i, j).

for i, j in itertools.product(range(n), range(n)):
    my_array[i, j] = f(i, j)