I'm not exactly sure what you want to plot 
against with. However, you can try out this fimplicit function. Here is an example to plot the circle.
against with. However, you can try out this fimplicit function. Here is an example to plot the circle.fimplicit(@(x,y) x.^2 + y.^2 - 1)
axis square
Hope it helps. For more info, please check out:
