| Error Bars Using Coyote Graphics [message #86893] |
Tue, 10 December 2013 11:27  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
Recent questions in this news group caused me to look at cgErrPlot
again. Writing this program as a direct copy of IDL's own ErrPlot was
one of the worst decisions I've ever made. So, I've decided to retire
this program. (Actually, I've decided to use it as a chew toy for Coyote
out in the back yard. Shouldn't last too long.)
What I have done instead is just added Error Bar drawing capability to
cgPlot via some new ERR_* keywords. This way, if you have error
information (either in the X or Y dimension) when you create the plot,
you can use it then. Or, you can add the error bars to the plot later by
setting the OVERPLOT keyword, etc. You can draw high errors or low
errors or both, in either the horizontal or vertical direction. It is
almost infinitely flexible, and--more importantly--it makes sense. At
least to me. :-)
While I was at it, I also added the ability to automatically convert
longitude/latitude values to XY projected meters if you happen to be
plotting (or, more likely, overplotting) symbols and error bars on maps
that use a projected meter data space (as they ALL should!). You can
pass in a map coordinate object (cgMap) with the MAP_OBJECT keyword, as
you can with cgPlotS.
You can find updated documentation here:
http://www.idlcoyote.com/idldoc/cg/cgplot.html
And you can find the updated cgPlot code here:
http://www.idlcoyote.com/programs/cgplot.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")
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