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Re: Log axes using object graphics [message #20430 is a reply to message #20387]

Fri, 23 June 2000 00:00

Brad Gom
Messages: 49
Registered: August 1997

Member

Hi Ben,

thanks for the test. It turns out that the problem is a divide by zero error in
the object graphics code, caused when there is only one major tick mark in the
range. "Floating illegal operand" doesn't show up on my PC, but it hints at the
problem.

Here is the reply I got from Karl at RSI:

> It is a bug in IDL 5.3.
>
> When you change the range so that only one tick is needed on the axis,
> the bug shows up. There is a div by 0 problem in there and the code
> goes into an infinite loop.
>
> I'll open a bug report for you.
>
> As a work-around, you might try specifying MAJOR=2 to force two ticks
> on the axis. I tried this in your program and got really nice
> results.
>
> Happily, the problem does not occur in IDL 5.4. I've changed much of
> the axis support for another reason and apparently exorcised this
> gremlin in the process.
>
Thanks

Brad

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[Message index]

		Log axes using object graphics By: Brad Gom on Tue, 20 June 2000 00:00
		Re: Log axes using object graphics By: Brad Gom on Fri, 23 June 2000 00:00
		Re: Log axes using object graphics By: Ben Tupper on Fri, 23 June 2000 00:00
		Re: Log axes using object graphics By: Brad Gom on Wed, 21 June 2000 00:00

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