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Re: Plotting time [message #46646 is a reply to message #46548]

Tue, 29 November 2005 17:31

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mark Hadfield writes:

> David sent me some code in which a date axis as described by the OP was
> grafted into his XPLOT plotting window application thingy. The axis
> appeared in the wrong place, off the left-hand edge of the plot window,
> as reported. I traced the problem. XPLOT gets the axes in the right
> place by adjusting the scaling, something like this
>
> xAxis->GetProperty, CRange=xrange
> xs = Normalize(xrange, Position=[xn0,xn1])
> xAxis->SetProperty, XCoord_Conv=xs
>
> where xn0 & xn1 are the desired end points of the axis in normalised
> coordinates.
>
> NORMALIZE was doing its calculations in single-precision floating point
> and returning a single-precision result. Once I changed everything to
> double-precision, the axis appears in the right place.

Ah, *my* NORMALIZE does it's calculations in double precision. But I
just noticed that my XPLOT has an *old* copy that does it in single
precision. Just another reminder to all you aspiring IDL programmers
out there that you should really, REALLY check your assumptions. :-)

Thanks, Mark.

Cheers,

David

P.S. The *new* version of XPLOT will not include NORMALIZE. :-)

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Plotting time By: clivecook59 on Fri, 25 November 2005 08:37
		Re: Plotting time By: Mark Hadfield on Tue, 29 November 2005 16:57
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 17:31
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 15:09
		Re: Plotting time By: Mark Hadfield on Tue, 29 November 2005 14:57
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 14:18
		Re: Plotting time By: Mark Hadfield on Tue, 29 November 2005 14:09
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 10:55
		Re: Plotting time By: clivecook59 on Tue, 29 November 2005 10:42
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 10:37
		Re: Plotting time By: clivecook59 on Tue, 29 November 2005 10:08
		Re: Plotting time By: David Fanning on Tue, 29 November 2005 08:56
		Re: Plotting time By: clivecook59 on Wed, 30 November 2005 12:44

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