| Re: Plot3D bug in 8.1 [message #75911] |
Mon, 09 May 2011 06:33  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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David Grier writes:
> I've confirmed that the following code works in IDL 8.0.1
> but fails in 8.1, even though the documentation for Plot3D
> has not changed between the two versions:
>
> x = randomu(seed, 100)
> y = randomu(seed, 100)
> z = randomu(seed, 100)
> orb = orb()
> p = plot3d(x, y, z, SYM_OBJECT = orb)
>
> In IDL 8.0.1, this creates an object graphics plot with
> spheres at the vertices.
>
> By contrast, IDL 8.1 emits the following error message,
> and no plot:
> % PLOT3D: Unknown property: SYM_OBJECT
> % Execution halted at: $MAIN$
>
> This quite clearly is a bug, therefore.
>
> Strangely enough, iplot still understands the SYM_OBJECT keyword
> in IDL 8.1.
I don't know whether this has anything at all to do
with my theory of IDL 8 function graphics, but it is
exactly the kind of error I would have predicted for
these overly complex programs. My theory is that it will
be nearly impossible to make modifications to these programs
without breaking something else. If my theory is correct,
we should see more errors of this type whenever there
is a new IDL release.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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