| Re: plotting with respect to time [message #35750] |
Wed, 09 July 2003 09:14 |
msgentry
Messages: 3
Registered: July 2003
|
Junior Member |
|
|
Thanks! My plots are coming out fine now.
Megan
msgentry@unity.ncsu.edu (Megan) wrote in message news:<3f101107.0307080817.2e44fda7@posting.google.com>...
> I'm having some trouble making graphs in IDL. I have a program where I've
> calculated a growth rate of a quantity for certain intervals of time.
> I'm trying to graph my results now. Basically I have two arrays, one with
> the growth rates and the other with the julian times corresponding to them.
> The interval between measurements is a few minutes, and it is
> irregular. Is there a certain plot function or command that will allow me
> to plot my results with regular times as the x-axis labels.
> Ideally, since the measurements are every few minutes, I'd like to have it
> with the hour, minute, and second along the x-axis of the graph.
> Thanks for your help,
> Megan
|
|
|
|
| Re: plotting with respect to time [message #35760 is a reply to message #35750] |
Tue, 08 July 2003 14:50  |
Mark Hadfield
Messages: 783
Registered: May 1995
|
Senior Member |
|
|
"Megan" <msgentry@unity.ncsu.edu> wrote in message
news:3f101107.0307080817.2e44fda7@posting.google.com...
> I'm having some trouble making graphs in IDL. I have a program where I've
> calculated a growth rate of a quantity for certain intervals of time.
> I'm trying to graph my results now. Basically I have two arrays, one with
> the growth rates and the other with the julian times corresponding to
them.
> The interval between measurements is a few minutes, and it is
> irregular. Is there a certain plot function or command that will allow me
> to plot my results with regular times as the x-axis labels.
> Ideally, since the measurements are every few minutes, I'd like to have it
> with the hour, minute, and second along the x-axis of the graph.
> Thanks for your help,
I recommend you check out the C() (calendar) format codes. In IDLDE, type
"?format codes".
With intervals of a few minutes you will need to ensure that your time data
are in double precision and are plotted that way. IDL has supported
double-precision plotting for a few versions now. In Direct Graphics all you
need to do to activate it (I think) is to supply double-precision data. In
Object Graphics, your IDLgrView needs to have the DOUBLE keyword set.
--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)
|
|
|
|
| Re: plotting with respect to time [message #35764 is a reply to message #35760] |
Tue, 08 July 2003 10:28 |
Haje Korth
Messages: 651
Registered: May 1997
|
Senior Member |
|
|
Megan,
Check the online help for the 'LABEL_DATE' function. It will do exactly what
you want.
haje
--
Dr. Haje Korth
Space Physics Group
The Johns Hopkins University
Applied Physics Laboratory
MS MP3-E128
11100 Johns Hopkins Road
Laurel, MD 20723-6099
USA
Phone: 240-228-4033 (Washington), 443-778-4033 (Baltimore)
Fax: 240-228-0386 (Washington), 443-778-0386 (Baltimore)
e-mail: haje.korth@jhuapl.edu
"Megan" <msgentry@unity.ncsu.edu> wrote in message
news:3f101107.0307080817.2e44fda7@posting.google.com...
> I'm having some trouble making graphs in IDL. I have a program where I've
> calculated a growth rate of a quantity for certain intervals of time.
> I'm trying to graph my results now. Basically I have two arrays, one with
> the growth rates and the other with the julian times corresponding to
them.
> The interval between measurements is a few minutes, and it is
> irregular. Is there a certain plot function or command that will allow me
> to plot my results with regular times as the x-axis labels.
> Ideally, since the measurements are every few minutes, I'd like to have it
> with the hour, minute, and second along the x-axis of the graph.
> Thanks for your help,
> Megan
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
