# Plot 1d eigenvector
**URL:** https://community.freefem.org/t/plot-1d-eigenvector/2975
**Category:** General Discussion
**Created:** [February 19, 2024, 6:39am UTC](https://community.freefem.org/t/plot-1d-eigenvector/2975 "2024-02-19T06:39:27Z")
**Posts on this page:** 1
**Page:** 1
### Author:  [@Amitkaush](https://community.freefem.org/u/Amitkaush)
#### Post date: [February 19, 2024, 6:39am UTC](https://community.freefem.org/t/plot-1d-eigenvector/2975/1 "2024-02-19T06:39:27Z")
I want to plot 1d eigenvector obtained by solving the following problem in MATLAB using eigs
```auto
matrix A;
matrix B;
//LHS
varf a11([u,v,w,p],[a1,a2,a3,a4])=int1d(Th)(a1*(U*a*I+(a^2+b^2)*re)*u+re*dy(a1)*dy(u)+a1*Uy*v+a1*I*a*p+
a2*(U*a*I+(a^2+b^2)*re)*v+re*dy(a2)*dy(v)-p*dy(a2)+
a3*(U*a*I+(a^2+b^2)*re)*w+re*dy(a3)*dy(w)+a3*I*p*b+
I*a4*(a*u+b*w)-v*dy(a4)
)+on(1,2,u=0,w=0,v=0);
//RHS
varf b1([u,v,w,p],[a1,a2,a3,a4])=int1d(Th)((a1*u+a2*v+a3*w+a4*p*0.000001)*I)+on(1,2,u=0,v=0,w=0);
A=a11(Gh,Gh,tgv=-1,solver=sparsesolver);
B=b1(Gh,Gh,tgv=-2,solver=GMRES);
```
Apparently ffmatlib can plot only for only 2D and 3D case