Numpy Part- 2

[tanyapunyo]

while taking sub matrix, the value of 2 is taken as whereas in other actions 2 will be taken as 2-1

[abhinetrakumar]

There are some mismatches in syntax and example, I'm confused.
Like in insert() method

[devilmaycarebutGODdonot]

When subset is edited through mathematical operations and stored in itself then original array do not change i.e.
C=numpy.add(C, numpy.arange(6).reshape (2, 3))
Why