If either index of a 2D slice is -1 there are unexpected results. If the slice is a get there may be an error or a BlockGrid with zero dimension, if it is a set then nothing happens.
This is due to the behavior in BlockGrid._get_double_slice. If the index is -1 it will make a slice of -1:0, which results in nothing.
If either index of a 2D slice is -1 there are unexpected results. If the slice is a get there may be an error or a
BlockGridwith zero dimension, if it is a set then nothing happens.This is due to the behavior in
BlockGrid._get_double_slice. If the index is -1 it will make a slice of-1:0, which results in nothing.