RosettaCodeData/Task/Matrix-arithmetic/Jq/matrix-arithmetic-4.jq

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# Requires lup/0
def det:
def product_diagonal:
. as $m | reduce range(0;length) as $i (1; . * $m[$i][$i]);
def tidy: if . == -0 then 0 else . end;
lup
| (.[0]|product_diagonal) as $l
| if $l == 0 then 0 else $l * (.[1]|product_diagonal) | tidy end ;