how do i plot a complicated function

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atpsafa saputra
atpsafa saputra 2021-5-11
回答： Stephan 2021-5-11
i tried to plot a function but it only produced an empty image
clc;
clear all;
alpha = 2;
gamma = 3;
k1 = 0.5;
k2 = 0.15;
eta = @(x,y)(sqrt((x*k1+gamma*(1-y)-alpha)^2-4*x.*(gamma*k2*(1-y)-alpha*k1))-(x*k1+gamma*(1-y)-alpha))/(2*x);
F = @(x,y)alpha-2*x.*eta-(k1*(alpha-x.*eta))/(x+k1)-(1-y);
fimplicit(F,[-20 20 -20 20])

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回答（1 个）

Stephan
Stephan 2021-5-11
Ran in:
alpha = 2;
gamma = 3;
k1 = 0.5;
k2 = 0.15;
syms eta(x,y) Eta
eta(x,y) = (sqrt((x*k1+gamma*(1-y)-alpha)^2-4*x.*(gamma*k2*(1-y)-alpha*k1))-(x*k1+gamma*(1-y)-alpha))/(2*x);
F(x,y) = alpha-2*x.*Eta-(k1*(alpha-x.*Eta))/(x+k1)-(1-y);
fun = subs(F,Eta,eta)
fun(x, y) = 
fimplicit(fun,[-2 1 -50 20])

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