If you're using the timestep number in the file names of your vtk files, 
are you formatting the filename to allow more than three digits? (e.g. 
solution-999.vtk versus solution-0999.vtk.)

It's hard to tell without seeing any of your code.
Cheers,
Jonathan 

On Saturday, November 3, 2018 at 11:16:02 PM UTC-7, [email protected] 
wrote:
>
> Hi All,
>
> I am running a code where the system I want to solve is time-dependent, 
> which means:
>
> [image: 快快快.JPG]
>
> So, I want to solve u_{n+1} by using u_{n} in each time step n.
> If my code is broken suddenly ,at time step n=1000 for example, how to 
> restart it from time step t_n = 1001, not t_n=1? And in each time step, I 
> have a output VTK file of solution u.
>
> Thank you in advance!
>
> Best,
> Chucui
>

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