| Re: PV-Wave plotting adventures [message #15650] |
Wed, 02 June 1999 00:00 |
Richard G. French
Messages: 65
Registered: June 1997
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Member |
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I think all of this behavior stems from IDL using SINGLE precision
constants for plot scales, and I certainly agree that after all these
years, it is time to fix this behavior. There have been posts on this
newsgroup for some time about the problems this causes, and for the life
of me it is hard to see how single precision plot scales can still be
justified. Maybe when memory was at a premium and computers were slow,
it made sense to do things in single precision, but being stuck with
single precision scales is a much worse predicament! I'd love to learn
that there is a way around this annoying behavior.
DIck French
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| Re: PV-Wave plotting adventures [message #15654 is a reply to message #15650] |
Wed, 02 June 1999 00:00  |
mgs
Messages: 144
Registered: March 1995
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Senior Member |
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In article <37556853.E138DD23@ssec.wisc.edu>, Liam Gumley
<Liam.Gumley@ssec.wisc.edu> wrote:
> Martin LUETHI GL A8.1 2-4092 wrote:
>> Here is a little caveat for all users of PV-Wave plotting routines (I hope
>> this is fixed in IDL!). The errors appeard in PV-WAVE v6.10 (Solaris) but as
>> far as I remember were in all earlier versions (however I did not fully
>> realize the reason of this sometimes strange behaviour...)
> [examples deleted]
>
> The following example produces interesting results in IDL 5.2:
>
> window,/free,xs=500,ys=800
> !p.multi=[0,1,3,0,0]
> !p.charsize=2.0
> dx=1.0d-4
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
> dx=1.0d-3
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
> dx=1.0d-2
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
>
> The non-uniform tick spacing on the Y axis of the middle plot is quite
> novel.
>
> Cheers,
> Liam.
Grid spacing on the top plot is non-uniform for MacOS and Windows with
x0=100.0d0, and non-uniform on the middle plot with x0=1000.0d0. Is that
also true with UNIX variants?
IDL> Help, !Version, /Str
** Structure !VERSION, 5 tags, length=40:
ARCH STRING 'PowerMac'
OS STRING 'MacOS'
OS_FAMILY STRING 'MacOS'
RELEASE STRING '5.2'
BUILD_DATE STRING 'Oct 30 1998'
IDL> Help, !Version, /Str
** Structure !VERSION, 5 tags, length=40:
ARCH STRING 'x86'
OS STRING 'Win32'
OS_FAMILY STRING 'Windows'
RELEASE STRING '5.2'
BUILD_DATE STRING 'Oct 30 1998'
--
Mike Schienle Interactive Visuals, Inc.
mgs@ivsoftware.com Remote Sensing and Image Processing
http://www.ivsoftware.com/ Analysis and Application Development
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| Re: PV-Wave plotting adventures [message #15656 is a reply to message #15650] |
Wed, 02 June 1999 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Liam Gumley wrote:
> The following example produces interesting results in IDL 5.2:
>
> window,/free,xs=500,ys=800
> !p.multi=[0,1,3,0,0]
> !p.charsize=2.0
> dx=1.0d-4
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
> dx=1.0d-3
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
> dx=1.0d-2
> plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
>
> The non-uniform tick spacing on the Y axis of the middle plot is quite
> novel.
A definition for x0 would be helpful: try either of
x0=1000.0d0
x0=100.0d0
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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| Re: PV-Wave plotting adventures [message #15657 is a reply to message #15650] |
Wed, 02 June 1999 00:00 |
Liam Gumley
Messages: 473
Registered: November 1994
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Senior Member |
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Martin LUETHI GL A8.1 2-4092 wrote:
> Here is a little caveat for all users of PV-Wave plotting routines (I hope
> this is fixed in IDL!). The errors appeard in PV-WAVE v6.10 (Solaris) but as
> far as I remember were in all earlier versions (however I did not fully
> realize the reason of this sometimes strange behaviour...)
[examples deleted]
The following example produces interesting results in IDL 5.2:
window,/free,xs=500,ys=800
!p.multi=[0,1,3,0,0]
!p.charsize=2.0
dx=1.0d-4
plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
dx=1.0d-3
plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
dx=1.0d-2
plot,[0],[0],xrange=[x0,x0+dx],yrange=[x0,x0+dx],xstyle=1,ys tyle=1
The non-uniform tick spacing on the Y axis of the middle plot is quite
novel.
Cheers,
Liam.
--
Liam E. Gumley
Space Science and Engineering Center, UW-Madison
http://cimss.ssec.wisc.edu/~gumley
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