whenever I use ezcontourf I get an error message. How can I fix this? Or is there another function I can use instead?

syms x y;
illum = 300/(4*pi*((x - 5)^2 + (y - 2)^2 + 3^2))  
ezcontourf(@illum, [0 10 0 4]); colormap('gray'); axis equaltight  

Answer 1

[Walter Roberson]

ezcontourf(illum, [0 10 0 4]); colormap('gray'); axis equal tight