| Try this [message #12959] |
Tue, 22 September 1998 00:00  |
Ray Sterner
Messages: 10
Registered: December 1997
|
Junior Member |
|
|
Try this:
x=dindgen(1000)/999.*20.
for f=0.,10.,.02 do begin plot,/xstyl,x+f*1D6,sin(x) & empty & endfor
Ray Sterner sterner@tesla.jhuapl.edu
The Johns Hopkins University North latitude 39.16 degrees.
Applied Physics Laboratory West longitude 76.90 degrees.
Laurel, MD 20723-6099
|
|
|
|
| Re: Try this [message #13019 is a reply to message #12959] |
Fri, 25 September 1998 00:00  |
R. Bauer
Messages: 137
Registered: November 1996
|
Senior Member |
|
|
Ray Sterner wrote:
> Try this:
>
> x=dindgen(1000)/999.*20.
> for f=0.,10.,.02 do begin plot,/xstyl,x+f*1D6,sin(x) & empty & endfor
>
> Ray Sterner sterner@tesla.jhuapl.edu
> The Johns Hopkins University North latitude 39.16 degrees.
> Applied Physics Laboratory West longitude 76.90 degrees.
> Laurel, MD 20723-6099
Very nice Ray,
This is a very good example to show the impossibility of plot with double.
I know from your jsplot how to get around of this problem.
The description of plot should be taken seriously.
regards
Reimar
Calling Sequence
PLOT, [X,] Y
Arguments
X
A vector argument. If X is not specified, Y is plotted as a function of
point number (starting at zero). If both arguments are provided, Y is
plotted as a function of X.
This argument is converted to single-precision floating-point before
plotting. Plots created with PLOT are limited to the range and precision
of single-precision floating-point values.
--
R.Bauer
Institut fuer Stratosphaerische Chemie (ICG-1)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
|
|
|
|
| Re: Try this [message #13074 is a reply to message #12959] |
Wed, 30 September 1998 00:00 |
mgs
Messages: 144
Registered: March 1995
|
Senior Member |
|
|
In article <bowman-3009981916340001@chinook.tamu.edu>, bowman@null.tamu
(Kenneth P. Bowman) wrote:
> In article <6uamdh$gid$1@reznor.larc.nasa.gov>, "Joe"
> <Post.Reply@This.News.Group> wrote:
>
>> The
>> !x and !y structures are not double precision in their .range (and
>> other related) fields so it won't matter. This has to be done for
>> speed reasons since to make them double would force all plots
>> to use double precision calculations along with the attendant
>> decrease in computational rate.
>
> Many, if not most, modern Unix workstations have 64-bit floating point
> units and do double precision arithmetic as fast or faster than single
> precision.
>
> Ken Bowman
Which makes me wonder what the majority of IDL and PV-WAVE licenses run
on. I suspect the majority are PC's. I assume RSI and VNI are not in the
habit of releasing these kind of numbers, though.
--
Mike Schienle Interactive Visuals
mgs@ivsoftware.com http://www.ivsoftware.com
|
|
|
|
| Re: Try this [message #13075 is a reply to message #12959] |
Wed, 30 September 1998 00:00 |
bowman
Messages: 121
Registered: September 1991
|
Senior Member |
|
|
In article <6uamdh$gid$1@reznor.larc.nasa.gov>, "Joe"
<Post.Reply@This.News.Group> wrote:
> The
> !x and !y structures are not double precision in their .range (and
> other related) fields so it won't matter. This has to be done for
> speed reasons since to make them double would force all plots
> to use double precision calculations along with the attendant
> decrease in computational rate.
Many, if not most, modern Unix workstations have 64-bit floating point
units and do double precision arithmetic as fast or faster than single
precision.
Ken Bowman
--
Kenneth P. Bowman, Professor 409-862-4060
Department of Meteorology 409-862-4466 fax
Texas A&M University bowmanATcsrp.tamu.edu
College Station, TX 77843-3150 Change the AT to @
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
