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Do we want to return the fluxError vector? #9

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DougBurke opened this issue Sep 19, 2021 · 1 comment

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DougBurke commented Sep 19, 2021

In Sherpa we ignore the fluxError component, but we should probably support it for the small (?) number of models that use it.

It would complicate things - e.g. maybe we'd want to return some form of named, or structured, tuple?

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DougBurke commented Sep 20, 2021 •

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HEASOFT 6.29 / XSPEC 12.12.0 only has two models with flag values that are not 0 and they are

smaug
pileup

both of whih have flags of [0, 1] - ie they do not use fluxErrors but can not be easily cached

So it's only for usermodels.

% egrep 'pileup|smaug' ~/local/heasoft-6.29/spectral/manager/model.dat
smaug         22   0.0E+00    1.0E+20        c_xsmaug    add 0  1
pileup         7  0.001      1.0e20          C_pileup    acn 0  1

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