Custom sort?

[Didier Lachieze]

(01-20-2019 06:09 PM)EricR Wrote:  Hi! I need to sort lists of lists according to their second element, i.e. an input {{1, 2}, {2, 2.5}, {3, 1.5}} should result in an output {{2, 2.5}, {1, 2}, {3, 1.5}}.

SORT({{1,2},{2,2.5},{3,1.5}},2) will return {{3,1.5},{1,2},{2,2.5}}.
If you want the second elements in descending order, just reverse the list:
REVERSE(SORT({{1,2},{2,2.5},{3,1.5}},2)) will return {{2,2.5},{1,2},{3,1.5}}