[Numpy-discussion] shape, size

[Daniel Holth]

In python, if na is a numarray:

>>> na
array([[0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
       [1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1]])

I can type

>>> nb = na[:,:4]
>>> nb
array([[0, 1, 0, 1],
       [1, 0, 1, 0]])

>>> nb[0][0]=17

>>> na
array([[17,  1,  0,  1,  0,  1,  0,  1,  0,  1,  0,  1,  0,  1,  0],
       [ 1,  0,  1,  0,  1,  0,  1,  0,  1,  0,  1,  0,  1,  0,  1]])

nb and na share data.

How do you write nb = na[:,:4] in a C extension module?

Thanks,

Daniel Holth