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Re: Error Bar Thoughts [message #74846 is a reply to message #74769]

Wed, 02 February 2011 15:16

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Wayne Landsman writes:

>
> On Wednesday, February 2, 2011 12:50:24 PM UTC-5, David Fanning wrote:
>
>> to specify the location of the high and low locations
>> of the bar? As an offset from the data point?
>
> For what it is worth, the ITTVIS supplied procedure PLOTERR specifies the error as an offset from the data point, but the ITTVIS supplied ERRPLOT wants the low and high values. In my own work, errors are nearly always suplied as a offset (e.g. Poisson errors are a square root of the counts). Note that users often want to display X along with Y error bars.
>
> The two most difficult parts of writing my own PLOTERROR ( http://idlastro.gsfc.nasa.gov/ftp/pro/plot/ploterror.pro ) were handling the X/YLOG and NSUM keywords to PLOT. You don't want the entire logarithmic plot to abort because one of the error bars extends to negative numbers, and you want to appropriately reduce the size of the error bars when summing data together. ---Wane

OK, tell me again why I am re-inventing this wheel!?
Or, the Legend wheel, for that matter.

It seems to me that if there are good routines out
there like this we ought be be able to just make
them work with Coyote Graphics routines. It's pretty
simple, really.

It seems to me I should be spending my time inventing
a Coyote Seal of Approval that we could attach to
good routines that handled colors correctly and could
be used in resizeable graphics windows. Then everyone
could be working on this and I could get back to doing
what I do best: drinking lattes. Maybe I could make
a web page with pointers to these routines so they
are easy to find.

Just a thought. :-)

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]

		Error Bar Thoughts By: David Fanning on Wed, 02 February 2011 09:50
		Re: Error Bar Thoughts By: Jeremy Bailin on Thu, 03 February 2011 04:19
		Re: Error Bar Thoughts By: Paul Van Delst[1] on Wed, 02 February 2011 16:48
		Re: Error Bar Thoughts By: David Fanning on Wed, 02 February 2011 15:16
		Re: Error Bar Thoughts By: wlandsman on Wed, 02 February 2011 13:26
		Re: Error Bar Thoughts By: David Fanning on Wed, 02 February 2011 12:32
		Re: Error Bar Thoughts By: Gray on Wed, 02 February 2011 12:22

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