Fatal error: "entries are not monotonically increasing"

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SUMMARY

The error "entries are not monotonically increasing" occurs when using the SI card set to H for gamma spectra data that does not conform to this requirement. The discussion highlights that the SI card should be set to L for gamma spectra, which consists of discrete energies and probabilities. Users are advised to revert to the original data before any reordering and to ensure the correct SI card setting is applied to visualize the spectrum accurately.

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Basmah
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I have encpuntered this error with the gamma spectra "entries are not monotonically increasing". Despite attempting the following solutions, the issue remains unresolved:
  • Rearranging Energies in ascending order.
  • Removed any duplicate energy values.
What may be causing this error? and how can I solve it?
 

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Welcome to PF @Basmah,

The SI card defaults to H, a histogram with monotonically increasing entries, which this input data very much isn't. That would make sense if this is a distribution being modeled. If this is a gamma spectrum then the table is probably a series of discrete energies and probabilities so the SI card should start with an L

So I suggest you go back to your original data before you tried to order it, use L and see if the spectrum (try a simple geometry, no materials, a tally with energy bins) is what you expect.
 

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