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Re: Why isn't this working ? axis problem (probably very simple) [message #28099 is a reply to message #28098]

Tue, 20 November 2001 07:37

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Henk (henk@mailandnews.com) writes:

> I want to plot data on a graph with as left y-axis the pressure
> (logarithmic) and to the right the altitude (not log).
> I'm trying to do this this way :
>
> plot, o_arr,10^(alt_arr),
> xrange=[xmin,xmax],yrange=[1013,1],/ylog,color=1,ystyle=9,yt itle='Pressure'
>
> and
>
> axis,yaxis=1, ystyle=1,ytitle = 'Altitude',color=1,yrange=[0,40]
>
> but it gives a warning about an infinite range !
> Why is this ? I don't understand. It must have something to do with
> the log plot, I guess, but even with a 'ylog=0' as parameter to 'axis'
> it won't work.
>
> Could someone help me out ?

This is a really common problem. I should write an
article about it. :-)

The problem is that log axes are "sticky", unlike
almost everything else in IDL. Once you do something
with logs, IDL appears to remember it forever. (Probably
holding it against you, for all I know.)

What you have to do is "unstick" the log axis before
you make your AXIS call. You need something like this:

plot, o_arr,10^(alt_arr),ylog,,ystyle=9,ytitle='Pressure'
!Y.Type=0
axis,yaxis=1, ystyle=1,ytitle = 'Altitude',color=1,yrange=[0,40]

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Why isn't this working ? axis problem (probably very simple) By: Henk on Tue, 20 November 2001 08:00
		Re: Why isn't this working ? axis problem (probably very simple) By: David Fanning on Tue, 20 November 2001 07:42
		Re: Why isn't this working ? axis problem (probably very simple) By: David Fanning on Tue, 20 November 2001 07:37

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