About Chandra Archive Proposer Instruments & Calibration Newsletters Data Analysis HelpDesk Calibration Database NASA Archives & Centers Chandra Science Links

Skip the navigation links
Last modified: 21 September 2006

URL: http://cxc.harvard.edu/sherpa3.4/bugs/io_notice.html
Hardcopy (PDF): A4 | Letter

I/O Bugs: notice


Bugs

  1. If the instrument background set and you try to filter on energy, you will get a warning.


Bugs

  1. If the instrument background set and you try to filter on energy, you will get a warning.

    However, if you then add "source" to the filtering syntax to correct the command, an error is printed and the filter command is ignored:

    sherpa> ignore all           
    sherpa> notice energy :0.3,7:      
    WARNING: filter command ignored -- cannot be applied to dataset 1
    WARNING: filter command ignored -- cannot be applied to dataset 1
    sherpa> notice source energy :0.3,7:
    Error: filter stack cannot be reduced; filter reset.
    
    sherpa> notice source energy :0.3,7:
    sherpa>
    

    As shown, issuing the correct filter a second time works properly.

Hardcopy (PDF): A4 | Letter
Last modified: 21 September 2006


The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory.
60 Garden Street, Cambridge, MA 02138 USA.    Email: cxcweb@head.cfa.harvard.edu
Smithsonian Institution, Copyright © 1998-2004. All rights reserved.