Writting in sub-ndarray of a ndarray in the most pythonian way. Python 2

Question

I have a ndarray like this one:

number_of_rows = 3
number_of_columns = 3
a = np.arange(number_of_rows*number_of_columns).reshape(number_of_rows,number_of_columns         


        

Answer 1

For the continuous rows and columns case, you can use basic slicing like this:

In [634]: a
Out[634]: 
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])

In [635]: b = np.asarray([[100, 101],[102, 103]])

In [636]: a[:rows_to_keep[1]+1, columns_to_keep[0]:] = b

In [637]: a
Out[637]: 
array([[  0, 100, 101],
       [  3, 102, 103],
       [  6,   7,   8]])

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