What could be the reason for this fzero error and how to solve it ?

조회 수: 8 (최근 30일)
VIGNESH BALAJI
VIGNESH BALAJI 2024년 2월 2일
댓글: VIGNESH BALAJI 2024년 2월 9일
This is the error message
This was the warning I got too along with the error message
This is the 5 lines of code to reproduce the error
dd = 0.1069;
vv = 0.7889;
L = 1;
fun = @(aa) ( (-(sqrt(L^2-(vv)^2)/2)) + (aa*sinh(((dd)/2)/aa)) ); xx0 = 0.15; %[10^-6, 10^6];
aa = abs(fzero(fun,xx0));
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Torsten
Torsten 2024년 2월 7일
If you look at the f(a) and f(b) values in your output, you can see that both are negative in all iterations. Thus fzero does not find a sign change and keeps on serching for suitable limits a and b for which f(a)*f(b) < 0 holds.
VIGNESH BALAJI
VIGNESH BALAJI 2024년 2월 9일
@Torsten thanks, I now understand the reason behidn fzero error. Both your answer and @Dyuman Joshi heped me to solve this problem. I am not sure how to accept both of your answers to close this thread.

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답변 (2개)

Torsten
Torsten 2024년 2월 2일
Use "fsolve" instead of "fzero":
aa = fsolve(fun,xx0)
Matt J
Matt J 2024년 2월 2일
편집: Matt J 2024년 2월 2일
Ran in:
You should plot the function to get a better idea where the solution is,
dd = 0.1069;
vv = 0.7889;
L = 1;
fun = @(aa) ( (-(sqrt(L^2-(vv)^2)/2)) + (aa*sinh(((dd)/2)/aa)) );
fplot(fun,[0.01,0.05])
Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.
fzero(fun,[0.01,0.05])
ans = 0.0142

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