# coyote: CGDEMODATA

- coyote/Utilities
- [Source code]

Description

      The purpose of this function is to read a selection of standard
      data sets that are found in the normal IDL distribution in the
      subdirectory $IDL_DIR/examples/data. At least 25 data sets are
      available in all categories of data. The user selects one of the
      possible data sets with the mouse. Several of the data sets
      simply create data used to illustrate graphics commands (numbers 1-3),
      and two of the data sets produce random data. Data set 17 produces
      a random vector of 101 elements. Data set 18 produces a 2D array of
      random values, suitable for display as a contour plot or image.

Categories

      Utilities

Examples

      To load the world elevation data set::
          image = cgDemoData(7)

Author

      FANNING SOFTWARE CONSULTING::
          David W. Fanning
          1645 Sheely Drive
          Fort Collins, CO 80526 USA
          Phone: 970-221-0438
          E-mail: david@idlcoyote.com
          Coyote's Guide to IDL Programming: http://www.idlcoyote.com

History

      Change History::
        Written by:  David W. Fanning, 5 March 1999.
        Added some additonal random data capability. 29 April 99. DWF
        Added IMAGES keyword. 31 March 2000. DWF.
        Fixed a problem with the CANCEL button. 25 Oct 2002. DWF.
        Added new JPEG, DICOM, TIFF, and PGN images. 30 Oct 2002. DWF.
        Modified old program units to work with IDL strict arrays. 29 June 2003. DWF
        Yikes! Somehow lost the event handler for the CANCEL button! Fixed. 1 Jan 2012. DWF.
        Added 2D Combined Gaussian data set. Renamed utility routines. 22 Jan 2013. DWF.

Copyright

      Copyright (c) 2011-2013, Fanning Software Consulting, Inc.
      es multiple smoothing. A routine from the JHUAPL IDL Library.

Params

      selection: in, optional, type=integer
         The data set selection number. If not present, a graphical user
         interface is presented to the user so that a data set may be
         selected.

Keywords

      cancel: out, optional, type=boolean
         If a graphical user interface is used for the data selection, this output
         keyword is set to 1 if the user clicks the CANCEL button. Otherwise, it is
         set to 0.
      group_leader: in, optional, type=long
         The identifier of a widget group leader for this widget application. If the
         group leader dies, this program will die as well.
      images: in, optional, type=boolean, default=0
         Set this keyword if you wish to see only 2D images in the selection widget.