minIndex

import mir.ndslice.slice: sliced;
auto s = [
    2, 6, 4, -3,
    0, -4, -3, 3,
    -3, -2, 7, 8,
    ].sliced(3, 4);

auto index = s.minIndex;

assert(index == [1, 1]);
assert(s[index] == -4);

index = s.maxIndex;

assert(index == [2, 3]);
assert(s[index] == 8);

import mir.ndslice.slice: sliced;
auto s = [
    -8, 6, 4, -3,
    0, -4, -3, 3,
    -3, -2, 7, 8,
    ].sliced(3, 4);

auto index = s.minIndex;

assert(index == [0, 0]);
assert(s[index] == -8);