I think by "three matrices" OP meant "two vectors" .. it's just that instead of having $Ax,$Ay,$Az and $Bx, $By, $Bz, OP is instead passing [$Ax, $Bx], [$Ay,$By], [$Az,$Bz] to his sub.

In reply to Re^2: Dot product of three matrices by davidrw
in thread Dot product of three matrices by Angharad

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