Chandra X-Ray Observatory
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Last modified: December 2013

URL: http://cxc.harvard.edu/sherpa/ahelp/show_data.html
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AHELP for CIAO 4.6 Sherpa v2

show_data

Context: info

Synopsis

Display the data sets

Syntax

show_data([id, outfile=None, clobber=False] )

Description

The show_data command displays the data sets which have been loaded into Sherpa.

  • id - the id of the dataset to use; default is to show information for all available datasets.
  • outfile - name of the file in which to store the information
  • clobber - a Boolean switch which indicates whether or not the 'outfile' should be overwritten, if the file already exists; default=False

The command output looks like:

Data Set: 1
Filter: 0.2993-7.0007 Energy (keV)
Noticed Channels: 21.0-480.0
name           = case1_1.pha
channel        = Float64[1024]
counts         = Float64[1024]
staterror      = None
syserror       = None
bin_lo         = None
bin_hi         = None
grouping       = None
quality        = None
exposure       = 50000.0
backscal       = 1.0
areascal       = None
grouped        = False
subtracted     = False
units          = energy
response_ids   = [1]
background_ids = []

RMF Data Set: 1:1
name     = core1.rmf
detchans = 1024
energ_lo = Float64[1077]
energ_hi = Float64[1077]
n_grp    = Int16[1077]
f_chan   = UInt32[1500]
n_chan   = UInt32[1500]
matrix   = Float64[440721]
offset   = 1
e_min    = Float64[1024]
e_max    = Float64[1024]

ARF Data Set: 1:1
name     = core1.arf
energ_lo = Float64[1077]
energ_hi = Float64[1077]
specresp = Float64[1077]
bin_lo   = None
bin_hi   = None
exposure = 34397.739985

The behavior of the screen output is determined by the user's $PAGER environment variable setting, which is usually a variant of "more." To disable paging within show_all() - i.e. print the entire contents, even if it scrolls offscreen - change this setting to "cat" before starting Sherpa:

unix% setenv PAGER cat

unix% sherpa

Example 1

sherpa> show_data()

Print information on all datasets to the screen.

Example 2

sherpa> show_data(2, "sherpa.data", True)

Write the information for dataset id=2 to the file "sherpa.data", clobbering any file with the same name.

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

filtering
show_filter
info
list_bkg_ids, list_functions, show_all, show_bkg_model, show_bkg_source, show_conf, show_covar, show_fit, show_method, show_model, show_proj, show_source, show_stat

Last modified: December 2013
Smithsonian Institute Smithsonian Institute

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