DistBetween2Segment​HP(A1,A2,B1,B2)

Designed for high performance computation. Return distances between N segments and N segments.

This function is designed for high performance computation by avoiding use any loop and judgement statement. It can return N distances between N 2D segments and N 2D segments.
% A1,A2 is the matrix of two points of segment A, N*2
% B1,B2 is the matrix of two points of segment A, N*2
% shortestdistance is the matrix of distances between each two segment N*1
% directionvector indicate the vector of the shortestdistance N*2
% closepointonA and closepointonB is the nearest points on two segments N*2

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