angle between 2 edges

maya - mel - angle2Edges

float $o[]= (`pointPosition -w polySurface70.vtx[120]`);   
vector $O= << $o[0] , $o[1] , $o[2] >>;   // start

float $u[]= (`pointPosition -w polySurface70.vtx[122]`);  
vector $U= << $u[0] , $u[1] , $u[2] >>;   // end0
$U = $U - $O;

float $v[]= (`pointPosition -w locator1`);  
vector $V= << $v[0] , $v[1] , $v[2] >>;   // end1
$V = $V - $O;

float $a=rad_to_deg (`angle $U $V`);