python - how to extract a zero-dimensional slice from a 1-dimensional array in numpy -

python - how to extract a zero-dimensional slice from a 1-dimensional array in numpy -

is there way piece zero-dimensional sub-array 1-dimensional array?

for example, if have n-dimensional ndarray arr, arr[0] returns (n-1)-dimensional ndarray.

however, if have 1-dimensional ndarray x, x[0] doesn't homecoming 0-dimensional ndarray, rather numpy.int64, (if x contains int64s).

minimal example:

def increment(zero_d_array): zero_d_array[...] = zero_d_array + 1 counter = numpy.array(0) # zero-dimensional array containing scalar 0 increment(counter) # success; counter 1 counters = numpy.zeros(3, dtype=int) # [0, 0, 0] increment(counter[1]) # fails; counter[1] numpy.int64, not 0-d array

i realize above work increment(counter[1:2]), because increment() happens work both 0-d , 1-d inputs. not functions flexible.

use ellipsis:

increment(counter[1, ...])

python numpy slice matrix-indexing