plot gradient of pde
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Hi,
1) I solved the laplace equation and found the electric field using:
u= assempde(b,p,e,t,c,a,f); %laplace equation on rectangle geometry
[Ex,Ez] = pdegrad(p,t,-u); %find electric field
ugrad = [Ex;Ez];
how to plot Ex and Ez as a function of (x,z) (seperatly, not as a quiver plot)?
- using tri2grid and plot it with "surf" is not an opption becouse the grid is very very large and it takes a lot of time to execute "tri2grid".
2) how can I find the values of Ex,Ez,U at the boundaries without using "tri2grid"?
- eventualy I need just the solution of U,Ex,Ez at the bounderies
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Answers (1)
Alan Weiss
on 8 Feb 2016
Use pdeplot with the xydata name-value pair set to Ex or Ez. You could even set xydata to Ex and zdata to Ez.
Alan Weiss
MATLAB mathematical toolbox documentation
2 Comments
Alan Weiss
on 10 Feb 2016
Did you try my suggestion? It works for me:
[p,e,t] = initmesh(@lshapeg);
u = assempde(@lshapeb,p,e,t,1,0,1);
[ux,uy] = pdegrad(p,t,u);
pdeplot(p,e,t,'xydata',ux,'zdata',uy)
Alan Weiss
MATLAB mathematical toolbox documentation
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