Difference in tallies.out and statepoint.h5 hdf file values

User Support
1

Hi Everyone…
When I use more than one tally id to find different (more than one) parameters then the values in tallies.out and statepoint.h5 hdf file do not match. But when I use only one tally id for one parameter and do not insert other tallies in the same file then both values in tallies.out and statepoint.h5 hdf file match. Anyone knows why they are not same? and by which factor they are different…I want to calculate more than one parameters by using same one tallies.xml file. Actually I want to copy data from output file of openmc into excel for calculations which is easy from statepoint.h5 file.
Regards,
Mirza Younis Baig

2

Mirza,

That’s interesting; I don’t think I’ve ever seen such behavior, aside from the number of significant digits reported being less in the tallies.out file. How are you extracting information from the statepoint.h5 file?

Thanks,
Adam

3

Mirza,

I’m not sure how you are looking at values in the statepoint file. If you are looking at the file directly rather than using the Python API, you should be aware that the values in the file are not the mean and standard deviation that you would see in tallies.out; instead they are the sum and sum-of-squares for each of the tally bins. The mean and its standard deviation are determined using equations that are found in our theory manual.

Best,
Paul

4

Thanks Paul,
You pointed out the mistake I made in looking at data in tallies.out and statepoint.h5 file.
Regards