I am trying to use an active contour and I get the error
Error using contour (line 46)
Input arguments for contour must be real. Use the function REAL to get the real part of the inputs.
Error in ruller (line 184)
hold on,[c,h] = contour(phi,[0 0],'r','linewidth',1); hold off
Can someone please explain me what this error is all about?