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Re: Plotting time [message #46548 is a reply to message #46515]

Tue, 29 November 2005 16:57

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

David Fanning wrote:
> Hang on a minute and I'll make it easy for you. :-)

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.

>> Incidentally, LABEL_DATE is evil; the C() formats are much better, and
>> not *that* hard to construct.
>
> It is screwy with or without LABEL_DATE.

Sure. That was just me riding one of my hobby horses.

--
Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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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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