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.
Utilities
To load the world elevation data set:: image = cgDemoData(7)
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
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 (c) 2011-2013, Fanning Software Consulting, Inc. es multiple smoothing. A routine from the JHUAPL IDL Library.
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.
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.