comp.lang.idl-pvwave archive: archive » Re: Plot according to slopes?

Home » Public Forums » archive » Re: Plot according to slopes?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Plot according to slopes? [message #60200 is a reply to message #60199]

Mon, 05 May 2008 07:46

Frank Wang
Messages: 6
Registered: May 2008

Junior Member

On May 5, 10:00 pm, David Fanning <n...@dfanning.com> wrote:
> Frank Wang writes:
>> I am new with IDL, and recently I was bothered with:
>
>> "How to make line plot when you know the slopes(of the lines you are
>> going to plot) defined at each grid point"?
>
>> Physically, we can draw a short line segment at each grid point, link
>> neighboring segments, and then smooth them. But I simply find it too
>> tricky to do this with ID(or Matlab). Does anyone have any
>> suggestions? I would appreciate your help. Or you can tell me which
>> chapter of the IDL manual should I refer to?
>
> I guess if you knew the slopes at each point, you could
> calculate UV vector pairs that would describe the slope.
> If so, then you could use something like VELOVECT or
> PLOT_FIELD to plot them. A lot of people use PARVELVECT
> from the NASA Astronomy Library to plot this kind of data,
> too.
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Thank you, David. But would you tell me where to download PARVELVECT(I
searched it over google, but got no result)?
Thank you again for help.

Cheers,

Frank

Report message to a moderator

[Message index]

		Re: Plot according to slopes? By: Frank Wang on Mon, 05 May 2008 09:07
		Re: Plot according to slopes? By: Frank Wang on Mon, 05 May 2008 09:05
		Re: Plot according to slopes? By: David Fanning on Mon, 05 May 2008 08:19
		Re: Plot according to slopes? By: Frank Wang on Mon, 05 May 2008 08:17
		Re: Plot according to slopes? By: rigby on Mon, 05 May 2008 07:57
		Re: Plot according to slopes? By: Frank Wang on Mon, 05 May 2008 07:46
		Re: Plot according to slopes? By: David Fanning on Mon, 05 May 2008 07:00

Previous Topic:	Plot according to slopes?
Next Topic:	System Variable question

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Oct 12 13:12:36 PDT 2025

Total time taken to generate the page: 1.89647 seconds