> Then I tried to run example program step-17. Everything seemed quit
> well. But things changed when I invoked step-18. Step-18 gave me the
> following out put:
> 
> ========================setp-18 output==============================
> Timestep 1 at time 1
>   Cycle 0:
>     Number of active cells:       3712 (by partition: 3712)
>     Number of degrees of freedom: 17226 (by partition: 17226)
>     Assembling system... norm of rhs is 2.34224e+10
>     Solver converged in 104 iterations.
>     Updating quadrature point data...
>   Cycle 1:
>     Number of active cells:       12812 (by partition: 12812)
>     Number of degrees of freedom: 51738 (by partition: 51738)
>     Assembling system... norm of rhs is 2.32185e+10
>     Solver converged in 122 iterations.
>     Updating quadrature point data...
>     Moving mesh...
> 
> Timestep 2 at time 2
>     Assembling system...[0]PETSC ERROR: --------------------- Error
> Message ------------------------------------
> [0]PETSC ERROR: Argument out of range!
> [0]PETSC ERROR: Inserting a new nonzero (10379, 10377) into matrix!

This is a bug that Timo Heister fixed back in February, I believe, and that 
showed up with newer versions of PETSc. If you want to run step-18, you may 
have to download the current development sources of deal.II, as explained on 
the download page.

Best
 W.


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Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/
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