Why is there a jagged line when I plot this function?
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Hi guys,
I am trying to plot an implicit function and am getting strange results. I understand the smooth part of the function, but not the jagged part. Why is the jagged part there at all? Also, what can I do to eliminate it?
Here's the code:
f1=(@(x,y) (5.*y.^(1./2) -3)./(2.5.*y.^(1./2)+2.5.*x.^(1./2)-3)-y);
fimplicit(f1,[0 4 0 4],'black')
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tmarske
le 16 Mar 2020
It's because fimplicit is using too few evaluation points, resulting in too coarse an interpolation (by default it uses 151). You can override this using the 'MeshDensity' argument:
f1=(@(x,y) (5.*y.^(1./2) -3)./(2.5.*y.^(1./2)+2.5.*x.^(1./2)-3)-y);
fimplicit(f1,[0 4 0 4],'black', 'MeshDensity', 5000)
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Walter Roberson
le 17 Mar 2020
Modifié(e) : Walter Roberson
le 17 Mar 2020
If you have the symbolic toolbox, you can solve f1 for x in term of y to get a single x for each y. you can then linspace() for y and put those through the equation to derive x, and then plot(x,y)
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