Sorting a 2D numpy array by multiple axes
- by perimosocordiae
I have a 2D numpy array of shape (N,2) which is holding N points (x and y coordinates). For example:
array([[3, 2],
[6, 2],
[3, 6],
[3, 4],
[5, 3]])
I'd like to sort it such that my points are ordered by x-coordinate, and then by y in cases where the x coordinate is the same. So the array above should look like this:
array([[3, 2],
[3, 4],
[3, 6],
[5, 3],
[6, 2]])
If this was a normal Python list, I would simply define a comparator to do what I want, but as far as I can tell, numpy's sort function doesn't accept user-defined comparators. Any ideas?
