[ESSDIFFRACTION] Fix multiplication with mask - #674
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jl-wynen
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July 24, 2026 09:32
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Multiplication does not work with inf and nan.
nvaytet
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Jul 24, 2026
| hist.data = hist.data.copy() | ||
| hist.values *= irreducible_mask(hist.masks, hist.dim).values | ||
| if hist.variances is not None: | ||
| replacement = sc.scalar(0.0, variance=0.0, unit=hist.unit, dtype=hist.dtype) |
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I guess this is the usual question: should the variance be 0, and thus being a very tight constraint on fits?
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I think I would nan the masked values instead of 0. Makes them easier to distinguish from real zeros
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Good point. I tried that and easydiffraction doesn't like it. It raises
TypeError: Value mismatch for <reduced_tof.data.1.intensity_meas>. Provided nan outside [0, inf]. Keeping current 0.0.
Judging by that error message, inf would be valid.
@AndrewSazonov How do we best encode masked data? In this case, it is masked because the vanadium measurement has a 0 in a bin.
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Inf feels like it would just be a workaround/hack. Would make more sense if NaN was accepted downstream.
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I messed this up in #673
sc.whereinstead of multiplication because the latter does not work when the data is Inf or NaN.