Utility Bugs: bflux

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11 Nov 2008

These are the webpages relative to Sherpa in the CIAO 3.4 release (18 December 2006). They are no longer actively updated, however the CXC will continue limited support of CIAO 3.4 for the near future.

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Bugs

Problems calculating flux and counts over a range.

The behavior described in this bug applies to the following commands:

[B]EFLUX,
[B]PFLUX,
[B]DCOUNTS,
[B]MCOUNTS,
and the corresponding "get" commands (e.g. get_eflux).

Given x > 0:

"EFLUX (0:x)" returns the same value as "EFLUX" (i.e. the flux over the full range of the dataset), when it should return the flux integrated from the start of the dataset to x.
"EFLUX (x:0)" returns the same value as "EFLUX (x)." This should return an error since x > 0, so the range isn't sensible.

Workaround:

replace 0 with a small decimal, e.g. 0.001. Then case 1 gives the correct answer (flux from the start of the dataset to x), and case 2 gives 0 (which at least tells you that you did something wrong).