Python: Creating the "negative" of an array

Question

I have this 64x64 2D array the data for this array can be downloaded here - http://m.uploadedit.com/ba3s/1494223164755.txt

Now, I wish to make a copy of this array in which the areas that have the highest value receive the value of the areas with the lowest value and vice-versa. Is there a smart way of doing it in Python?

a.max() - a or a.max() - a + a.min() if you don't care or do for the range of values in output? — Divakar
– Divakar, Commented May 7, 2017 at 13:02
@Divakar, just a minor note: a.max()+a.min()-a is better than a.max()-a+a.min() because it avoids creating unnecessary temp arrays. — shx2
– shx2, Commented May 7, 2017 at 13:08

shx2 · Accepted Answer · 2017-05-07 13:02:23Z

4

If your data is stored in a 2dim numpy array arr, you can do:

arr2 = arr.max() + arr.min() - arr

answered May 7, 2017 at 13:02

shx2

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