### 2D

`xm = -1.5:0.1:1.5;`

ym = -1.5:0.1:1.5;

[x,y] = meshgrid(xm,ym);

f = x.^2 + y.^2 - 1;

contour(x,y,f,[0,0]);

### 3D

`xm = -1.5:0.1:1.5;`

ym = -1.5:0.1:1.5;

zm = -1.5:0.1:1.5;

[x,y,z] = meshgrid(xm,ym,zm);

f = x.^2 + y.^2 + z.^2 - 1;

isosurface(x,y,z,f,0);

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I would like to plot implicit function but i have a problem, I would like your assistance

Could I send my file and help me

Best Regrds

Sure. You can post the question here or send me by email, whatever convenient. My email is roach21cn at hotmail dot com.

I have trouble drawing an implicit function from a journal …

I hope you can help me to plot …

thank you for your help ^^

Excelent!!