Encounter an error while using fimplicit?

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Wajahat
Wajahat 2020-4-16
评论： Star Strider 2020-4-16
How to plot the following equation on matlab by using fimplicit?
(x-x0).*conj((x-x0))+(y-y0).^2=r^2
close all;
r=1./2;
x0=0;
y0=1./2;
syms x y
fimplicit((x-x0).*conj((x-x0))+(y-y0).^2-r^2)
axis equal
Matlab shows
'Undefined function or variable 'fimplicit'.'

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采纳的回答

Star Strider
Star Strider 2020-4-16
The fimplicit function was introduced in R2016b.
Use the contour function instead:
r=1./2;
x0=0;
y0=1./2;
f = @(x,y) (x-x0).*conj((x-x0))+(y-y0).^2-r^2;
xv = linspace(x0-r, x0+r, 25);
yv = linspace(y0-r, y0+r, 25);
[X,Y] = ndgrid(xv,yv);
figure
contour(X,Y,f(X,Y), [0 0])
grid
axis equal
.
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Wajahat
Wajahat 2020-4-16
I got this
which is not same as the previous attached hyperboic image
Star Strider
Star Strider 2020-4-16
Adjust the limits of ‘xv’ (and perhaps also ‘yv’) to match the figure you want.
For example:
xv = linspace(-1, 1, 25);
You may need to change the parameters in the ‘f’ function to exactly reproduce the figure you posted.

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