How to plot circle with Maxima? I cannot get equitation plotted
Expression:
f1: (x^2) + (y^2) = 9;

I try this command:
wxplot2d(f1, [x, -5, 5], [y, -5, 5]);

And it gives:
plot2d: expression evaluates to non-numeric value everywhere in plotting range.
plot2d: nothing to plot.

What is correct way to plot such expressions?

There are 4 methods to draw circle with radius = 3 and centered at the origin : 


*

*load(draw); draw2d(polar(3,theta,0,2*%pi));

*load(draw); draw2d(ellipse (0, 0, 3, 3, 0,360)

*plot2d ([parametric, 3*cos(t), 3*sin(t), [t,-%pi,%pi],[nticks,80]], [x, -4, 4])$

*load(implicit_plot);
z:x+y*%i;
implicit_plot (abs(z) = 3, [x, -4, 4], [y, -4, 4]);


Your function is implicit and multivalued
HTH
