# Arpack Error Max\_Iteration

**URL:** <https://community.freefem.org/t/arpack-error-max-iteration/2875>\
**Category:** General Discussion\
**Created:** [January 10, 2024, 4:35pm UTC](https://community.freefem.org/t/arpack-error-max-iteration/2875 "2024-01-10T16:35:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Efe\_Taner](https://avatars.discourse-cdn.com/v4/letter/e/8e7dd6/32.png) [@Efe\_Taner](https://community.freefem.org/u/Efe_Taner)\
**Post date:** [January 10, 2024, 4:35pm UTC](https://community.freefem.org/t/arpack-error-max-iteration/2875/1 "2024-01-10T16:35:43Z")

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Hello  
To calculate linear stability (eigenmodes), I have faced arpack error max iteration.  
matrix A=matrixA(Mh,Mh, solver=UMFPACK);  
matrix b=matrixB(Mh,Mh, solver=UMFPACK);

int k=EigenValue(A,b, sigma = sig , nev=nev, value = Evalues, vector= eux, tol=1e-5, ncv=5);  
How do we handle this problem?