| Re: cgplot clobbers user symbols [message #76073] |
Wed, 18 May 2011 21:46 |
Jeremy Bailin
Messages: 618
Registered: April 2008
|
Senior Member |
|
|
Yeah, it doesn't disturb me that it gets clobbered when you use non-built-in symbol numbers, but I was surprised that it would disappear for built-in ones.
In this case, you probably wouldn't want to - the symbol in question is actually
usersym, [0,1], [0,1]
i.e. a diagonal tick to the upper-right from the plot position. It only makes sense to use because I'm putting it on top of lines that are roughly diagonal the other way, so it nicely marks positions along the line, but I can't imagine anyone using it in any other context.
-Jeremy.
|
|
|
|
| Re: cgplot clobbers user symbols [message #76083 is a reply to message #76073] |
Wed, 18 May 2011 14:23  |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Jeremy Bailin writes:
> I just discovered a behaviour of cgPlot that disturbs me somewhat. If I define a user symbol using USERSYM and then use it in cgPlot using PSYM=8, it works fine. But I follow it up with PSYM=something_else, my user symbol gets clobbered and the next call with PSYM=8 plots it with something_else.
>
> For example:
>
> usersym, [-1,1], [-1,1] ; diagonal line
> ; this gives a diagonal line, as expected:
> cgplot, findgen(10), findgen(10), psym=8
> ; this gives plusses, as expected:
> cgplot, /overplot, findgen(10), findgen(10) + 0.5, psym=1
> ; I expected diagonal lines, but I get plusses:
> cgplot, /overplot, findgen(10), findgen(10) - 0.5, psym=8
>
>
> Is this "expected behaviour"?
Well, probably. :-)
The problem is, I am using USERSYM myself to create
plot symbols by calling SYMCAT. I suppose I don't
*have* to use USERSYM for symbols 1 and 4-6, I could just
return those numbers, but I am using it for some
reason. (I probably didn't like the symbols IDL
was creating, I would guess.)
In any case, I could restore this functionality for
symbols 1-7, but not for symbols 11-46, since I have
to use SYMCAT to produce those symbols.
The "best" solution, probably, would just be to extend
SYMCAT with the symbols you want to use. We can put
an unlimited number of symbols in there. Tell me what
you want, and I'll add them. Or, you can add them,
and send the file to me. :-)
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.")
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
