array([[1676.12529365, 4815.0, 5863.0], [1692.97253374, 1628.0, 2950.0], [
    1693.558384, 5742.0, 8240.0], [1695.86408654, 2140.0, 6969.0], [
    1696.68853948, 5477.0, 6641.0]])
huge matrix sorted and then find smallest elements with their indices into a list