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Segfault With Single Energy Bin #2

Description

@tjlaboss

MCNPTools experiences a Segmentation Fault when processing a meshtal file with only a single energy bin. A MWE will be posted.

MCNPTools attempts to compare to the "Total" bin, regardless of whether it exists. This occurs both in meshtal2vtk...

std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::compare (this=0x0, __s=0x47379d "Total")

...and the Python API:

import mcnptools
>>> mt = mcnptools.Meshtal("example.mesht")
>>> mt.GetTally(4)
Segmentation fault (core dumped)

Temporary workaround: Use emesh=0,1 instead of emesh=1.

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