[CIG-SHORT] stress in vtk files

[Tabrez Ali]

Yes I wanted to loop over multiple vtk files (containing displacement 
data) and then subtract data in consecutive files to get the velocities. 
Something like:

do i=1,500
(velocity_data_i.vtk) = (data in disp_i+1.vtk) - (data in disp_i.vtk)
end do

I think its easier for me to write a shell script for now.

Thanks anyway
Tabrez


Brad Aagaard wrote:
> I was assuming that Tabrez wants to create velocity time histories. 
> Thorsten is right that the calculator makes it very easy to do some 
> simple post-processing. It does not appear to be able to do looping 
> over time steps for processing of a series of snapshots. I could be 
> wrong and if someone knows how to create velocity time histories from 
> displacement snapshots, it would be great to learn how to do it.
>
> Brad
>
> Thorsten Becker wrote:
>> On Sat, 2008-05-17 at 11:39 -0700, Brad Aagaard wrote:
>>> Tabrez Ali wrote:
>>>> PyLith Users/Developers
>>>>
>>>> The vtk files containing stress results have six values for each 
>>>> component but which is what?
>>> Good question. I think this is missing from the manual.
>>> The order for the stress and strain components is
>>>
>>> 1-D: sigma_xx
>>>
>>> 2-D: sigma_xx, sigma_yy, sigma_xy
>>>
>>> 3-D: sigma_xx, sigma_yy, sigma_zz, sigma_xy, sigma_yz, sigma_xz
>>>
>>> Brad
>>>
>>>
>>>> Also is there a supereasy way "within" Paraview to obtain annual 
>>>> velocities from displacement data available each year, say from 
>>>> 0-500 yrs.
>>
>> I'm not sure if I understand the question, but Paraview has a calculator
>> tool (Filter->Alphabetical->Calculator, in 3.2.1, for example) that can
>> operate on all model scalars (including coordinates) and vectors (such
>> as velocities).
>>
>>
>>> I don't think there is an easy way. ParaView has a scripting 
>>> interface but I have no experience using it. This is one reason why 
>>> we want to add HDF5 output. It is very easy to write simple Matlab 
>>> or Python scripts to process data in HDF5 files.
>>>
>>> Brad
>>>
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