x^2 + y^2 =9

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I want to plot the above equation in matlab but i dont know how to plot please help or provide me code

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Answer 1

Dimitris Kalogiros 2019-10-29

编辑：Dimitris Kalogiros 2019-10-29

在 MATLAB Online 中打开

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This equation depicts a circle with radious 3.

clc; clearvars;
syms   x y
eq= x^2+y^2==9
fimplicit(eq, [-3 3]);
xlabel('x'); ylabel('y');
ax=gca;
ax.YAxisLocation='origin';  ax.XAxisLocation='origin' ;
ax.XLim=[-5 5]; ax.YLim=[-5 5];

In case you are not familiar with symbolic math toolbox, you can use the following

clc; clearvars;
ci=@(x,y) x.^2+y.^2-9;
fimplicit(ci, [-3 3 -3 3]);
xlabel('x'); ylabel('y');
ax=gca;
ax.YAxisLocation='origin';  ax.XAxisLocation='origin' ;
ax.XLim=[-5 5]; ax.YLim=[-5 5];