edgeLength3d

EDGELENGTH3D Return the length of a 3D edge.

   L = edgeLength3D(EDGE);  
   Returns the length of a 3D edge, with following representation:
   [x1 y1 z1 x2 y2 z2].

   Example
     p1 = [1 1 1];
     p2 = [3 4 5];
     edge = createEdge3d(p1, p2);
     edgeLength3d(edge)
     ans =
         5.3852
   
   See also
     edges3d, createEdge3d, drawEdge3d

0001 function len = edgeLength3d(edge, varargin)
0002 %EDGELENGTH3D Return the length of a 3D edge.
0003 %
0004 %   L = edgeLength3D(EDGE);
0005 %   Returns the length of a 3D edge, with following representation:
0006 %   [x1 y1 z1 x2 y2 z2].
0007 %
0008 %   Example
0009 %     p1 = [1 1 1];
0010 %     p2 = [3 4 5];
0011 %     edge = createEdge3d(p1, p2);
0012 %     edgeLength3d(edge)
0013 %     ans =
0014 %         5.3852
0015 %
0016 %   See also
0017 %     edges3d, createEdge3d, drawEdge3d
0018  
0019 % ------
0020 % Author: David Legland
0021 % e-mail: david.legland@inra.fr
0022 % Created: 2018-08-29,    using Matlab 9.4.0.813654 (R2018a)
0023 % Copyright 2018 INRA - Cepia Software Platform.
0024 
0025 if nargin == 1
0026     dp = edge(:, 4:6) - edge(:, 1:3);
0027 else
0028     dp = varargin{1} - edge;
0029 end
0030 
0031 len = hypot(hypot(dp(:,1), dp(:,2)), dp(:,3));