plot nonlinear equation in x y coordinate

clc
clear

syms x y 
SL_Ts=1800;
SL_Cm=1400;
ST_Ts=40;
ST_Cm=230;
SLT=100;

k=((x^2/(SL_Ts^2))-((x*y)/(SL_Ts^2))+((y^2)/(ST_Ts^2)))-1;
x_value=0:1800;

Answer 1

[Star Strider]

Try something like this —

syms x y 
SL_Ts=1800;
SL_Cm=1400;
ST_Ts=40;
ST_Cm=230;
SLT=100;

k=((x^2/(SL_Ts^2))-((x*y)/(SL_Ts^2))+((y^2)/(ST_Ts^2)))-1;
y = solve(k,y)

y = 

x_value=0:1800;

yfcn = matlabFunction(y)

yfcn = function_handle with value:
    @(x)[x./4.05e+3-sqrt(x.^2.*(-7.715096784026825e-10)+1.0./4.0e+2).*8.0e+2;x./4.05e+3+sqrt(x.^2.*(-7.715096784026825e-10)+1.0./4.0e+2).*8.0e+2]

figure
plot(x_value, yfcn(x_value))
grid
axis([0  2000    -50 50])

Experiment to get different results.

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