| Re: oplot - error in plotting to Z buffer only [message #14231] |
Mon, 08 February 1999 00:00 |
Dick Jackson
Messages: 347
Registered: August 1998
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Senior Member |
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Gwyn Fireman wrote:
>
> Well, I'm stumped.
>
> I have a routine to automatically generate a bunch o'gifs.
> Usually it works fine.
>
> On one set of data it fails with the error:
>
> % OPLOT: No valid points, must have at least 2 distinct points
>
> But, but - I *do* have points to plot!
> If I run this interactively I can re-enter the command after it gives
> the error, and it works fine. (But .con does not)
>
> AND if I plot to an X-window instead of to the Z-buffer (as I usually
> do when generating gifs) it runs fine.
>
> Has anyone seen a similar discrepancy?
> Is there something I need to know about the Z buffer?
This may be the same bug I've run into. In some cases, when plotting:
- with my own UserSym plot symbol (say a 20-point circle)
- to the Z-Buffer device
- right at the bottom or top edge of the plot where the UserSym might
meet or go over the edge (sorry, I don't remember exactly)
this very error would occur. When I fixed the YRange and plotted a set
of points that started off the bottom and crept onto the plot, I could
tell when it failed. I found a workaround, so I didn't get to the
bottom of this.
Hope this helps!
Cheers,
--
-Dick
Dick Jackson Fanning Software Consulting, Canadian Office
djackson@dfanning.com Calgary, Alberta Voice/Fax: (403) 242-7398
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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| Re: oplot - error in plotting to Z buffer only [message #14237 is a reply to message #14231] |
Mon, 08 February 1999 00:00  |
wmc
Messages: 117
Registered: February 1995
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Senior Member |
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Gwyn Fireman <fireman@mcst.gsfc.nasa.gov> wrote:
> On one set of data it fails with the error:
> % OPLOT: No valid points, must have at least 2 distinct points
> But, but - I *do* have points to plot!
I think I've seen this before, but can't remember the exact circumstances.
I seem to recall that the exact size of the window mattered - do you get the
same failures if the Z-buffer and interactive window are exactly the same
size?
-William
--
William M Connolley | wmc@bas.ac.uk | http://www.nbs.ac.uk/public/icd/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself
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| Re: oplot - error in plotting to Z buffer only [message #14245 is a reply to message #14231] |
Sat, 06 February 1999 00:00 |
J.D. Smith
Messages: 214
Registered: August 1996
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Senior Member |
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Gwyn Fireman wrote:
>
> Well, I'm stumped.
>
> I have a routine to automatically generate a bunch o'gifs.
> Usually it works fine.
>
> On one set of data it fails with the error:
>
> % OPLOT: No valid points, must have at least 2 distinct points
>
> But, but - I *do* have points to plot!
> If I run this interactively I can re-enter the command after it gives
> the error, and it works fine. (But .con does not)
>
> AND if I plot to an X-window instead of to the Z-buffer (as I usually
> do when generating gifs) it runs fine.
>
> Has anyone seen a similar discrepancy?
> Is there something I need to know about the Z buffer?
>
> Thanks.
>
> --
> ---- Gwyn F. Fireman
> ---- General Sciences Corporation
> ---- MODIS Characterization Support Team
> ---- Gwyn.Fireman@gsfc.nasa.gov 301-352-2118
Not to denigrate David's Blue Moon theory, but I'll bet a nickel that
the data frame for which the routine fails is corrupt or somehow not
correctly read in. I've been down the road of blaming the Z-Buffer for
all my problems, only later to discover some more plausible error. Are
you *certain* all you changed was set_plot,'Z' to set_plot,'X'?
JD
--
J.D. Smith |*| WORK: (607) 255-5842
Cornell University Dept. of Astronomy |*| (607) 255-6263
304 Space Sciences Bldg. |*| FAX: (607) 255-5875
Ithaca, NY 14853 |*|
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| Re: oplot - error in plotting to Z buffer only [message #14248 is a reply to message #14245] |
Fri, 05 February 1999 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Gwyn Fireman (fireman@mcst.gsfc.nasa.gov) writes:
> I have a routine to automatically generate a bunch o'gifs.
> Usually it works fine.
> On one set of data it fails with the error:
>
> % OPLOT: No valid points, must have at least 2 distinct points
>
> But, but - I *do* have points to plot!
> If I run this interactively I can re-enter the command after it gives
> the error, and it works fine. (But .con does not)
>
> AND if I plot to an X-window instead of to the Z-buffer (as I usually
> do when generating gifs) it runs fine.
Odd. I have a theory about IDL and blue moons, but
it needs further testing before I publish it. :-)
Cheers,
David
P.S. Is this reproducible? I mean, does the same
thing happen around the 15th of the month?
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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