Real solution for a variable in an equation
5 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hi all, I have an equation and I want to find the real solution (c>0), for eqn, but this code doesn't work. Could you please tell me what is wrong in the below code that I wrote. Thanks in advance for any help
V_plc=0.19;
Kf=0.18;
Kc=0.1;
Kp=0.15;
Kb=0.4;
Kh=0.05;
tau=0.18;
Ktau=0.045;
Vs=0.002;
Kbar=1.5e-5;
Ks=0.1;
Vpm=1.59e-4;
Kpm=0.15;
alpha0=6.81e-6;
alpha1=2.27e-5;
Kce=7;
delta=0.1;
gamma=5.5;
Kplc=0.055;
k_i=2;
ct=0.07;
syms c
p=(V_plc.*c.^2/(c.^2+Kplc.^2))./k_i;
h=Kh.^4./(Kh.^4+c.^4);
Po=((p.^2)*(c.^4).*h)./((p.^2).*(c.^4).*h.*(1+Kb)+Kb.*Kp.^2*(Kc.^4+c.^4-((c.^4*Kh.^4)./(c.^4+Kh.^4))));
jpm=Vpm.*(c.^2/(c.^2+Kpm.^2));
eqn=(((alpha1.*Kce.^4)./(jpm-alpha0))-Kce.^4).^(1/4)-((Vs.*c.^2)./(Kf.*Po.*(c.^2+Ks.^2)))-c==0;
S = solve(eqn,c,'Real',true)
0 Kommentare
Akzeptierte Antwort
Chunru
am 29 Aug. 2022
V_plc=0.19;
Kf=0.18;
Kc=0.1;
Kp=0.15;
Kb=0.4;
Kh=0.05;
tau=0.18;
Ktau=0.045;
Vs=0.002;
Kbar=1.5e-5;
Ks=0.1;
Vpm=1.59e-4;
Kpm=0.15;
alpha0=6.81e-6;
alpha1=2.27e-5;
Kce=7;
delta=0.1;
gamma=5.5;
Kplc=0.055;
k_i=2;
ct=0.07;
syms c
p=(V_plc.*c.^2/(c.^2+Kplc.^2))./k_i;
h=Kh.^4./(Kh.^4+c.^4);
Po=((p.^2)*(c.^4).*h)./((p.^2).*(c.^4).*h.*(1+Kb)+Kb.*Kp.^2*(Kc.^4+c.^4-((c.^4*Kh.^4)./(c.^4+Kh.^4))));
jpm=Vpm.*(c.^2/(c.^2+Kpm.^2));
% eqn=(((alpha1.*Kce.^4)./(jpm-alpha0))-Kce.^4).^(1/4)-((Vs.*c.^2)./(Kf.*Po.*(c.^2+Ks.^2)))-c==0;
% S = solve(eqn,c,'Real',true)
% The function you specified is a complex function that has no solution.
% Check out abs(f) which never reaches to 0.
f1= (((alpha1.*Kce.^4)./(jpm-alpha0))-Kce.^4).^(1/4)-((Vs.*c.^2)./(Kf.*Po.*(c.^2+Ks.^2)))-c;
fplot(real(f1), [0 1]); hold on
fplot(imag(f1), [0 1])
fplot(abs(f1), [0 1])
ylim([-1 1]*5)
xlim([0 0.4])
2 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Special Functions finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!