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Re: very simple but weird problem with CONTOUR [message #81276 is a reply to message #81274]

Sat, 01 September 2012 15:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

mxfong2012@gmail.com writes:

> Thanks, David, for your response! I am sorry that I don't get it. What did you mean by "your first contour
> is going to be drawn at 1.0"? In my example, I have 6 levels ranging from 0 to 1. By setting max_value=0.5, my intention was to draw the contours only at the levels of 0, 0.2, and 0.4. Please forgive the newbie question, as most of my research is on numerical calculations, and didn't have many experiences on IDL plotting.

My apologies. I was heading out the door and confused the c_levels
variable with the levels variable. Sorry.

Basically, I wouldn't be using the MAX_VALUE keyword
with a contour plot, because "missing values" will be
ignored by the contour algorithm. The result is always
unpredictable, and rarely what you had in mind. If you
want to contour only the first three contours, then just
pass the first three contours to the LEVELS keyword.

And, if I were new to IDL, I'd be using Coyote Graphics
routines, rather than the normal IDL direct graphics
routines. Things will make a good deal more sense to you. :-)

http://www.idlcoyote.com/graphics_tips/coyote_graphics.php

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: very simple but weird problem with CONTOUR By: mxfong2012 on Sat, 01 September 2012 16:25
		Re: very simple but weird problem with CONTOUR By: David Fanning on Sat, 01 September 2012 15:20
		Re: very simple but weird problem with CONTOUR By: Phillip Bitzer on Sat, 01 September 2012 14:32
		Re: very simple but weird problem with CONTOUR By: mxfong2012 on Sat, 01 September 2012 13:25
		Re: very simple but weird problem with CONTOUR By: David Fanning on Sat, 01 September 2012 11:41

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