Take multiple values of the array by indices

Question

I have a 2D array A: nxn with values of a function, and I want to take the values in different arrays for the black values, white values and gray values.

For example for the black and white values I wrote:

black_values = A[::2,::2]
white_values = A[1::2,1::2]

How to get the gray values?

Xirtaminu · Accepted Answer · 2020-11-25 14:50:40Z

3

If A is a 2D numpy array then:

A[::2,::2]

should get what you want.

answered Nov 25, 2020 at 14:50

Xirtaminu

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swag2198 Over a year ago

This fetches the black values and already mentioned in the question.

swag2198 · Accepted Answer · 2020-11-25 16:19:11Z

1

Note that the number of gray values are twice that of either black or white values. So you might use two arrays to store gray values.

g1 = A[::2, 1::2]
g2 = A[1::2, ::2]

Here you will get 2 16 x 16 arrays g1 and g2 that will store your 32 gray values.

answered Nov 25, 2020 at 16:19

swag2198

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