How to plot this ellipse

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Keshav
Keshav 2022-8-11
评论： Keshav 2022-8-14
I tried this; but did not get answer like in textbook. Please see my code and image.Kindly help
[x,y] = meshgrid(-300000:10000:600000);
z=(x.^2-15.156*x*y+229.7*y.^2+488.8*1000.0*1000.0+6844000*y-4.752*10.^10);
surf(x,y,z)
,y,z)
  2 个评论
Walter Roberson
Walter Roberson 2022-8-11
if you have the symbolic toolbox you can fimplicit()

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回答（1 个）

KSSV
KSSV 2022-8-11
Ran in:
syms s1 s2
t = 0 ;
eqn = s1^2-15.156*s1*s2+229.7*s2^2+488.8*t^2+6844000*s2==4.752*10^10 ;
fimplicit(eqn,[-600000 200000 -100000 20000])
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KSSV
KSSV 2022-8-12
Ran in:
syms s1 s2
t = 0 ;
eqn = s1^2-15.156*s1*s2+229.7*s2^2+488.8*t^2+6844000*s2==4.752*10^10 ;
h = fimplicit(eqn,[-600000 300000 -100000 20000]) ;
x1 = h.XData ; y1 = h.YData ;
t = 10000 ;
eqn = s1^2-15.156*s1*s2+229.7*s2^2+488.8*t^2+6844000*s2==4.752*10^10 ;
h = fimplicit(eqn,[-600000 300000 -100000 20000]) ;
x2 = h.XData ; y2 = h.YData ;
close all
figure
hold on
plot(x1,y1,'.r') ;
plot(x2,y2,'.b')

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