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Re: xrange woes [message #54911]

Wed, 18 July 2007 21:17

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

Josh <joshuamontague@gmail.com> writes:
> this is a new one for me...
> i'm plotting data points (~50) that are spread over a small x range
> (relative to the values). these data points lie at values around
> 2,000,000, but are spread over a range of about 0.01. I can use
> xrange=[x1,x2] up until the difference between x2 and x1 is about
> 0.25. If I try to make the range smaller, it is just ignored (and
> left at ~0.25) until the range decreases to 0.1 at which point the
> plotted x range jumps to ~30! The xstyle keyword follows the same
> pattern (works until the range is ~0.25, then is ignored).
>
> Has anyone else ever had this happen? Is there some limitation on how
> small xrange can be given the actual xvalues? btw, these data points
> have legitimate values to the standard double precision accuracy.

I always understood the IDL direct-graphics system to be limited to
single precision, even if your data is double precision.
Try subtracting the mean value and see if it works.

Craig

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[Message index]

		Re: xrange woes By: Craig Markwardt on Wed, 18 July 2007 21:17
		Re: xrange woes By: David Fanning on Wed, 18 July 2007 11:02
		Re: xrange woes By: Josh on Thu, 19 July 2007 13:26

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