| Re: Question on PLOTS command [message #2158 is a reply to message #2156] |
Tue, 07 June 1994 06:17  |
stl
Messages: 70
Registered: February 1994
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In article <2svmv4$6qf@mojo.eng.umd.edu> dpal@glue.umd.edu (Debabrata Pal) writes:
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> Hello everybody:
>
> I am trying to overlay the geometry of a computational domain on the contour plot. I am having no trouble in generating the contour plot. I am trying to generate the geometry of domain using PLOTS command. The geometry is very simple and can be generated by drawing a view horizontal nd vertical lines. But when i use PLOTS command to generate geometry, for example,
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> PLOTS, [0, 0],[.9,.9], i get an error message like this
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> % PLOTS: Data coordinate system not established.
>
> In other words, I am having trouble establishing the data coordinate system.
> Can anybody tell me how to establish the data coordinate system in this regard?
Hi,
Okay, IDL uses 3 coordinates systems:
Normal all data is between 0-1
Device for display, this is pixel coord
Data coordinates established with data range of a plot (or
controur, etc..)
Different routines have different defaults of what coordinate type to
accept. I believe your above command will work as follows: (assuming
you do indeed want to use normal coordinates)
PLOTS, [0, 0],[.9,.9],/Normal
This plots from point (0,0) to (.9,.9).
Remember, the first array are the x coordinates, and the second array
are the y coordinates.
-stephen
hope this helps a little
--
Stephen C Strebel / SKI TO DIE
strebel@sma.ch / and
Swiss Meteorological Institute, Zuerich / LIVE TO TELL ABOUT IT
01 256 93 85 / (and pray for snow)
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