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Set upper and lower interpolation bounds for MGXS data. #3803

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Merged
GuySten merged 5 commits into from
Feb 15, 2026
Merged

Set upper and lower interpolation bounds for MGXS data. #3803

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c63d818
Set upper and lower interpolation bounds for MGXS data.
nuclearkevin Feb 12, 2026
925bdd6
Style changes.
nuclearkevin Feb 12, 2026
9fe9422
Use iterators to find min/max loaded MG temperatures.
nuclearkevin Feb 14, 2026
36da8d0
Style changes.
nuclearkevin Feb 15, 2026
3862041
Fix iterator mistake.
nuclearkevin Feb 15, 2026
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8 changes: 8 additions & 0 deletions src/mgxs.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@
#include "openmc/error.h"
#include "openmc/math_functions.h"
#include "openmc/mgxs_interface.h"
#include "openmc/nuclide.h"
#include "openmc/random_lcg.h"
#include "openmc/settings.h"
#include "openmc/string_utils.h"
Expand Down Expand Up @@ -85,6 +86,13 @@ void Mgxs::metadata_from_hdf5(hid_t xs_id, const vector<double>& temperature,
delete[] dset_names;
std::sort(temps_available.begin(), temps_available.end());

// Set the global upper and lower interpolation bounds to avoid errors
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// involving C-API functions.
data::temperature_min =
std::min(data::temperature_min, temps_available.front());
data::temperature_max =
std::max(data::temperature_max, temps_available.back());

// If only one temperature is available, lets just use nearest temperature
// interpolation
if ((num_temps == 1) &&
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