Issue with fsolve tolerance

9 次查看（过去 30 天）
Mohit Kumar
Mohit Kumar 2020-5-10
回答： Mohit Kumar 2020-5-10
I am using fsolve to solve an overdetermined system of equations using the levenberg marquadt algorithm.
It works fine although giving the message "Equation solved, fsolve stalled." This is fine for 90% of my cases.
However, for particular systems of equations, my function value that is returned (fval) after saying that the equation is solved (with fsolve stalled) is
0.009486931983140
-0.035516210533842
-0.019252250306780
which is unacceptable for my need.
Since the default function tolerance is 1e-6, why does it accept this as a solution?

请先登录，再回答此问题。

采纳的回答

Mohit Kumar
Mohit Kumar 2020-5-10
Turns out function tolerance is compared with norm(fval)^2and the default tolerance was 1e-3. Simply changed it to 1e-10 (in accordance with my need) and its working well.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Solver Outputs and Iterative Display 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by