How to use ezplot

Hi im new to matlab, ive tried ez plot but it wont run x^2 - 9y^2=81. Can someone help?

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/fimplicit.html is recommended these days.

ezplot(@(x,y)x.^2 - 9*y.^2 - 81)

Answer 2

[Star Strider]

The ezsurf (and fsurf) functions accept only single-variable functions.

Try this:

figure
ezcontour(@(x,y) x^2 - 9*y^2 - 81, [-10 10 -10 10])

the fcontour, ezsurf and fsurf functions are also options.

Make appropriate changes to get the result you want.

EDIT — (9 Aug 2020 at 4:15)

Another possibility:

figure
hec = ezcontour(@(x,y) x^2 - 9*y^2, [-50 50 -50 50]);
hec.LevelList = 81;

.

[Walter Roberson]

but ezplot did do an implicit plot https://www.mathworks.com/help/matlab/ref/ezplot.html