Python: Setting an element of a Numpy matrix

Question

I am a pretty new to python. I have created an empty matrix

a = numpy.zeros(shape=(n,n))

Now I can access each element using

a.item(i,j)

How do I set an index (i,j)?

Answer 1

Here's how:

a[i,j] = x

Answer 2

Try this

a[i,j]=5

Answer 3

Or

a.itemset((i,j),x)