| Plotting double precision [message #19113] |
Thu, 24 February 2000 00:00  |
Jacques Basson
Messages: 17
Registered: May 1999
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Junior Member |
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Hi all
Does anyone know how I can plot double precision values in IDL. The plot
routine help says:
Plots created with PLOT are limited to the range and precision of
single-precision floating-point values.
Unfortunaltely, this means that values which do not lie in the
+-10^(+-38) range can't be easily plotted. Of course as luck would have
it, my values are of the order 10^(-39), and I'd rather not have factors
of 10 in my labels. The other option would be to take logs before
plotting rather than using the /ylog keyword, but I prefer the axis
label to have the value of the variable, rather than its log.
Thanks
Jacques Basson
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| Re: Plotting double precision [message #19299 is a reply to message #19113] |
Fri, 10 March 2000 00:00  |
Mark Goosman
Messages: 2
Registered: March 2000
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Junior Member |
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I am happy to say that in IDL 5.4, scheduled for release this summer, will
have support for
displaying double precision values in both Direct Graphics and Object
Graphics. In the case
of Direct Graphics, extensive work has been done to prevent IDL from
converting incoming
data to single precision values. The work in Object Graphics addressed the
limitations of
OpenGL accepting only single precision values for input.
Research Systems is interested in working with any IDL user who is
interested in participating
in the IDL 5.4 Beta program which will begin in the next couple of months.
Anyone who is interested
in participating as an IDL 5.4 Beta Tester can contact me at Research
Systems (mgoosman@rsinc.com).
We are always interested in making sure that changes and enhancements to any
area of IDL,
especially one as significant as the Direct and Object Graphics systems does
not cause problems
for existing IDL users and their applications.
Best regards,
Mark Goosman
********************************************
Mark Goosman
IDL Product Manager
Research Systems, Inc.
4990 Pearl East Circle
Boulder, CO 80301 USA
Tel: 303-413-3966
Fax: 303-786-9909
Email: mgoosman@rsinc.com
WWW: http://www.ResearchSystems.com
*************************************
Jacques Basson <jfb37@NOSPAM.cam.ac.uk> wrote in message
news:38B4FD5B.D776DF61@NOSPAM.cam.ac.uk...
> Hi all
>
> Does anyone know how I can plot double precision values in IDL. The plot
> routine help says:
>
> Plots created with PLOT are limited to the range and precision of
> single-precision floating-point values.
>
> Unfortunaltely, this means that values which do not lie in the
> +-10^(+-38) range can't be easily plotted. Of course as luck would have
> it, my values are of the order 10^(-39), and I'd rather not have factors
> of 10 in my labels. The other option would be to take logs before
> plotting rather than using the /ylog keyword, but I prefer the axis
> label to have the value of the variable, rather than its log.
>
> Thanks
> Jacques Basson
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| Re: Plotting double precision [message #19305 is a reply to message #19113] |
Fri, 10 March 2000 00:00 |
Richard G. French
Messages: 65
Registered: June 1997
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Member |
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THis has been a limitation in IDL since the beginning, and it surely
seems that the time has long since come for RSI to update PLOT so that
it can handle double precision. I understand the need for backward
compatibility, so if they want us to add a /DOUBLE keyword, I'm willing
to do it. Can we band together and urge RSI to do something about this
long-standing and unnecessary limitation?
Dick French
Jacques Basson wrote:
>
> Hi all
>
> Does anyone know how I can plot double precision values in IDL. The plot
> routine help says:
>
> Plots created with PLOT are limited to the range and precision of
> single-precision floating-point values.
>
> Unfortunaltely, this means that values which do not lie in the
> +-10^(+-38) range can't be easily plotted. Of course as luck would have
> it, my values are of the order 10^(-39), and I'd rather not have factors
> of 10 in my labels. The other option would be to take logs before
> plotting rather than using the /ylog keyword, but I prefer the axis
> label to have the value of the variable, rather than its log.
>
> Thanks
> Jacques Basson
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