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Re: Add diagonal 1:1 line in a plot? [message #53933 is a reply to message #53930]

Mon, 07 May 2007 20:33

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

DirtyHarry writes:

> Goodday, Everyone.
>
> I am writing a classical scientific paper comparing MODIS-retrieved
> data with ground measured data. I found several papers on this. Almost
> all of those papers have figures with 1:1 diagonal lines, and I want
> to draw this with IDL.
>
> I tried this way.
>
> pro OneOne ; Display 1:1 line
>
> device, decomposed=0, set_font='arial*24*bold'
> loadct, 30
>
> window, xsize=700, ysize=700
>
> readcol, 'dat.txt', nws, mod07, format='F, F'
> n=n_elements(nws)
>
> vsym, 24
> plot, nws, mod07, psym =2, title ='1:1 line - NWS vs MOD07', xtitle =
> 'NWS', ytitle = 'MOD07', xrange = [-5, 10], yrange = [-5, 10]
>
> end
>
> Now I got a plot with several dots. However, still I don't know how to
> add the diagonal 1:1 line. Please give me a suggestion. Thanks.

OPlot, [-5, 10], [-5, 10]

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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