fsolve and "Equation solved, fsolve stalled"

Question

Federico MegaMan 2019-11-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/492207-fsolve-and-equation-solved-fsolve-stalled

编辑： Matt J 2019-11-21

在 MATLAB Online 中打开

Hello,

when I run my fsolve it works, but appears this message:

"Equation solved, fsolve stalled.

fsolve stopped because the relative size of the current step is less than the

default value of the step size tolerance and the vector of function values

is near zero as measured by the default value of the function tolerance.

<stopping criteria details>".

What does it mean precisely?

clear all
clc 
close all
kT21=0;
kT22=pi/2;%87°
kr23=3.1623;
kT23=4.391248;%248.5°
kT31=0;%0.226;%13°
kr32=3.1623;
kT32=1.8919369;%106°
kT33=1.5*pi;
kT11=1.106538;%62
kT12=0;
kT13=0;%01.5*pi+1.517
kT14=0;%0.226;
kT15=5.176646;%316°
    
%x0=[kT11,kT12,kT13,kT14,kT15,kT22,kT23,kr23,kT31,kT32,kT33,kr32,jT21];
j=0;
xsol=zeros(13,51);
T21=zeros(1,51);
for t=0:0.1:5
    j=j+1;
    T11(j)=0.073*cos(t)+1.08;
end
for k=1:numel(T11)
  
    xsol(:,k)=fsolve(@(x) funz2(x), [T11(k),kT12,kT13,kT14,kT15,kT22,kT23,kr23,kT31,kT32,kT33,kr32,kT21]);
        kxsol=xsol(:,k);
kT13=kxsol(3);
kT21=kxsol(13);
kT12=kxsol(2);
kT14=kxsol(4);
kT15=kxsol(5);
kT22=kxsol(6);
kT23=kxsol(7);
kr23=kxsol(8);
kT31=kxsol(9);
kT32=kxsol(10);
kT33=kxsol(11);
kr32=kxsol(12);
T13(k)=kxsol(3);
T21(k)=kxsol(13);
T12(k)=kxsol(2);
T14(k)=kxsol(4);
T15(k)=kxsol(5);
T22(k)=kxsol(6);
T23(k)=kxsol(7);
r23(k)=kxsol(8);
T31(k)=kxsol(9);
T32(k)=kxsol(10);
T33(k)=kxsol(11);
r32(k)=kxsol(12);
end
figure;
plot(1:1:51, xsol);
title('xsol in funzione di t');
xlabe1=('t');
ylabe1=('xsol');
grid on;
figure;
plot(1:1:51, T11*180/pi);
title('T11 in funzione di t');
xlabe3=('t');
ylabe3=('T11');
grid on;
figure;
plot(1:1:51, T12*180/pi);
title('T12 in funzione di t');
xlabe4=('t');
ylabe4=('T12');
grid on;
figure;
plot(1:1:51, T13*180/pi);
title('T13 in funzione di t');
xlabe4=('t');
ylabe4=('T13');
grid on;
figure;
plot(1:1:51, T21*180/pi);
title('T21 in funzione di t');
xlabe2=('t');
ylabe2=('T21');
grid on;
figure;
plot(1:1:51, T23*180/pi);
title('T23 in funzione di t');
xlabe5=('t');
ylabe5=('T23');
grid on;
figure;
plot(1:1:51, r23);
title('r23 in funzione di t');
xlabe5=('t');
ylabe5=('r23');
grid on;
figure;
plot(1:1:51, T31*180/pi);
title('T31 in funzione di t');
xlabe6=('t');
ylabe6=('T31');
grid on;
figure;
plot(1:1:51, r32);
title('r32 in funzione di t');
xlabe6=('t');
ylabe6=('r32');
grid on;
 
function F=funz2(x)
T11=x(1);
T12=x(2);
T13=x(3);
T14=x(4);
T15=x(5);
T22=x(6);
T23=x(7);
r23=x(8);
T31=x(9);
T32=x(10);
T33=x(11);
r32=x(12);
T21=x(13);
F(1)=T12-T21;
F(2)=T31-T14;
F(3)=T13+T22-pi/2;
F(4)=T33-T22-pi;
F(5)=r23-(1+9-6*cos(T12+T13-1.5*pi))^(0.5);
F(6)=r32-(1+9-6*cos(pi-T14+T33))^(0.5);
F(7)=(5^(0.5))*cos(T11)+cos(T12)+4*cos(T13)+cos(T14)+(5^(0.5))*cos(T15)-8;
F(8)=(5^(0.5))*sin(T11)+sin(T12)+4*sin(T13)+sin(T14)+(5^(0.5))*sin(T15);
F(9)=cos(T21)+3*cos(T22)+r23*cos(T23);
F(10)=sin(T21)+3*sin(T22)+r23*sin(T23);
F(11)=cos(T31)+r32*cos(T32)+3*cos(T33);
F(12)=sin(T31)+r32*sin(T32)+3*sin(T33);
end