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Re: Y-Axis: Negitive numbers on top [message #1528 is a reply to message #1519]

Tue, 30 November 1993 15:30

thompson
Messages: 584
Registered: August 1991

Senior Member

deutsch@astro.washington.edu (Eric Deutsch) writes:

> In article 301193095555@bundy.aero.org, Ann_Mazuk@qmail2.aero.org (Ann Mazuk) writes:

>> I am running IDL 3.1.0 using VAX/VMS. I am making a plot and on the y-axis
>> I want negative numbers to be near the top of the y-axis and positive
>> numbers to be near the bottom of the y-axis, such that it looks similar to
>> this:
>>
>>
>> -3 |
>> -2 |
>> -1 |
>> 0 |
>> 1 |
>> 2 |__________________________
>> 1 2 3 4 5 6 7 8 9 10

> The initial solution is simply to use something like:

> IDL> plot,indgen(10)-8,yrange=[2,-10]

> The tricky part comes when you want to have automatic Y scaling and have it
> reversed. An ugly solution is:

> IDL> plot,indgen(10)-8
> IDL> plot,indgen(10)-8,yr=[!y.crange([1,0])]

> Anyone have a better solution?

> Eric

Why not just

IDL> Y = INDGEN(10)-8
IDL> PLOT, Y, YRANGE=[max(Y),min(Y)]

Bill Thompson

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		Re: Y-Axis: Negitive numbers on top By: sterner on Wed, 01 December 1993 13:56
		Re: Y-Axis: Negitive numbers on top By: thompson on Tue, 30 November 1993 15:30

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