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Re: Add diagonal 1:1 line in a plot? [message #53920]

Tue, 08 May 2007 07:03

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mike writes:

>> OPlot, [-5, 10], [-5, 10]
>
> Be careful with this - the slope of the line depends on the plot range
> and aspect ratio and the ratios of those to the arguments to oplot.
> I've found that using
>
>> oplot, !x.crange, !x.crange
>
> more often produces correct plots.

I had to do an Internet search to see what he meant
by a 1:1 line, but it seemed to me that the actual
slope didn't matter in this case. It was the ratio
that was important.

But, in any case, it would probably be smart to
have a plot that had a 1:1 aspect ratio, if only so you
don't confuse the casual reader of your paper.
You could always use my ASPECT program for this
purpose:

PLOT, data, POSITION=Aspect(1.0)

You can find ASPECT here:

http://www.dfanning.com/programs/aspect.pro

Of course, you can have aspect ratios be whatever
you want them to be:

Plot, data, POSITION=Aspect(2.0/3.0)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Add diagonal 1:1 line in a plot? By: David Fanning on Tue, 08 May 2007 07:03
		Re: Add diagonal 1:1 line in a plot? By: David Fanning on Tue, 08 May 2007 06:57
		Re: Add diagonal 1:1 line in a plot? By: Mike[2] on Tue, 08 May 2007 06:54
		Re: Add diagonal 1:1 line in a plot? By: kim20026 on Mon, 07 May 2007 21:57
		Re: Add diagonal 1:1 line in a plot? By: David Fanning on Mon, 07 May 2007 20:33

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