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*Subject*: How does IDL calculate the graph axis values?*From*: Declan Vogt <drv102(at)ohm.york.ac.uk>*Date*: Wed, 02 Feb 2000 16:05:34 +0000*Newsgroups*: comp.lang.idl-pvwave*Organization*: The University of York, UK*Sender*: drv102(at)york.ac.uk*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:18218

I'd like to find out what IDL will use as the max and min values for a graph axis before it actually plots the axis. I've been doing this by creating a window, drawing the axis, and reading !x.crange, then erasing the window, but it's not very elegant, and it doesn't work for postscript. Does anyone know if there is an IDL routine I can call? I need to do this, because I am trying to polar plot negative values, which I have to do by adding an offset to make them positive, and then drawing the axis values myself. But to start with, I need to choose an axis range, and since IDL does that so nicely, I'd like to use its code. Any hints? Declan

**Follow-Ups**:**Re: How does IDL calculate the graph axis values?***From:*Liam E. Gumley

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