S-lang-related Bugs: get_beflux

[Sherpa Logo]

Sherpa 3.4 Homepage
Sherpa 4.1 Homepage
Analysis Threads: Sherpa; General; ChaRT
Help Pages (AHELP)
Statistics
Optimization Methods
Documents: Publications
Scripts
FAQ
Bugs
Release Notes
CXC Links: CIAO (Data Analysis); Astrostatistics Collaboration
Site Map

News Previous Items

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.

15 Dec 2008

The newest version of the Chandra Interactive Analysis of Observations software, is CIAO 4.1, released on 15 December 2008. Read the release notes for detailed information. This release requires that CALDB 4.1.0 be installed for the software to work correctly.

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).