MATLAB: Plot the electric field distribution

contour

how Plot the electric field distribution above the contour ?
 % Plot the electric field distribution
figure;
v_now;
[ex,ey]=gradient(v);
quiver(-ex,-ey);  %Quiver command creates a plot, E=-grad(V), hence the negative sign 
title('potential ')
how put contour in the same figure of electric field distribution?

Best Answer

Use hold all before or after the first plot command:
 quiver(...)   % replace the dots with your data
 hold all;
 contour(...)
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