title: Subtract delaunay surfaces from each other
body: <p>I have a surface by the code below and another surface which is created by the exact same code. I want to see the height differences in another figure. How am I able to do that? Already operated with the Minus-operator but this won't work.</p>
  
  <p>Furthermore the matrices have NOT the same size!</p>
  
  <p>Appreciate your help!</p>
  
  <pre><code>x1 = Cx1;
  y1 = Cy1;
  z1 = Cz1;
  tri1 = delaunay(x1,y1);
  
  
  fig1 = figure%('units','normalized','outerposition',[0 0 1 1]);
  trisurf(tri1,x2,y2,z2)
  xlabel('x [mm] ','FontSize',30)
  ylabel('y [mm] ','FontSize',30)
  zlabel('z [mm] ','FontSize',30)
  </code></pre>