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

这是如何做：

a[i,j] = x

Answer 2

要么

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

Answer 3

尝试这个

a[i,j]=5