I cannot figure out how to fix this error "Objective function is returning undefined values at initial point. fsolve cannot continue."

4 ビュー (過去 30 日間)
function dummyhw8
clc
x0=[1,1,1,0.02,0,02,0.02];
x=fsolve(@fcn,x0);
disp ('Velocities are the first three values. Whereas friction is last 3.');
disp(x);
function z=fcn(x)
z(1)=x(1)-(0.64*x(2))-(0.64*x(3)); % where x1=v1 x2=v2 and x3=v3
z(2)=40-(102*x(4)*x(1)^2)-(127*x(5)*x(2)^2); % where x4=f1 x5=f2 x6=f3
z(3)=60-(102*x(4)*x(1)^2)-(127*x(6)*x(3)^2);
z(4)=1/sqrt(x(4))+2.0*log10((4.5e-4/3.7)+2.81e-5/x(1)/sqrt(x(4)));
z(5)=1/sqrt(x(5))+2.0*log10((5.625e-4/3.7)+3.52e-5/x(2)/sqrt(x(5)));
z(6)=1/sqrt(x(6))+2.0*log10((5.625e-4/3.7)+3.52e-5/x(3)/sqrt(x(6)));
  5 件のコメント
Dominic Riepenhoff
Dominic Riepenhoff 2021 年 11 月 28 日
Yup that did it, thanks! Prof gave us those values to guess with, so it still does not make the most sense but it works now.
Thanks again!
Dominic Riepenhoff
Dominic Riepenhoff 2021 年 11 月 28 日
Are there any ways (besides changing those values) to avoid this fsolve error, so that I could still use my initial guess values that are close to zero?

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回答 (1 件)

Matt J
Matt J 2021 年 11 月 28 日
編集済み: Matt J 2021 年 11 月 28 日
I suspect you meant to have 6 values in x0 rather than 7.
x0=[1,1,1,0.02,0.02,0.02];

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