Re: Plotting double precision (seg fault)

[Jacques Basson <jfb37(at)NOSPAM.cam.ac.uk>]

Just as well, I am starting to get really annoyed with errors like

     IDL> shade_surf, dindgen(50,50), (dindgen(50)+1)*1d+37, dindgen(50)
     % SHADE_SURF: Warning: Infinite plot range.
     Segmentation fault
     > 

whereas

     IDL> shade_surf, dindgen(50,50), (dindgen(50)+1)*1d+35, dindgen(50)

works perfectly :-(

Jacques

Mark Goosman wrote:
> 
> 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
> 38B4FD5B.D776DF61@NOSPAM.cam.ac.uk">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