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Re: how to draw streamline [message #59246 is a reply to message #59186]

Thu, 13 March 2008 13:32

chris_torrence@NOSPAM is currently offline

chris_torrence@NOSPAM
Messages: 528
Registered: March 2007

Senior Member

On Mar 7, 7:55 am, "Kenneth P. Bowman" <k-bow...@null.edu> wrote:
> In article
> < 92bef8cb-bd54-48b7-b54c-2ff9f4f75...@s8g2000prg.googlegroups .com >,
>
>
>
> wenfang_z...@hotmail.com wrote:
>> Hi,all
>> I want to draw the wind streamline map,and I try many methods
>> described in the forum, but some are wind vectors not the streamline,
>> which is the serial contour line with arrow on the contour plot.
>
>> some one ever mentioned that there was a script sample on the web site
>> http://www.metvis.com.au/idl/
>> but i can't get access to it.
>
>> so if there anybody who can load that web site and give a copy of both
>> the script and the streamline image for me?
>
>> I will appreciate your help!
>
>> wenfang
>
> Here is a sample code to plot 2-D streamlines using VEL.
>
> By default VEL chooses the initial points randomly, but the
> source code is available if you want to change that.
>
> Ken Bowman
>
> PRO STREAMLINE_DEMO
>
> n = 50
> x = FINDGEN(n)/(n-1)
> y = FINDGEN(n)/(n-1)
>
> xx = REBIN(x, n, n)
> yy = REBIN(REFORM(y, 1, n), n, n)
>
> u = -SIN(!PI*xx)*COS(!PI*yy)
> v = COS(!PI*xx)*SIN(!PI*yy)
>
> VEL, u, v, NVECS = 100, NSTEPS = 100, length = 0.5
>
> END

Following on from Ken's example, you might also try,

iVector, u, v, x, y, /STREAMLINES, STREAMLINE_NSTEPS=25

-Chris
ITTVIS

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[Message index]

		Re: how to draw streamline By: mankoff on Tue, 11 March 2008 10:25
		Re: how to draw streamline By: Kenneth P. Bowman on Fri, 07 March 2008 05:55
		Re: how to draw streamline By: David Fanning on Thu, 06 March 2008 20:06
		Re: how to draw streamline By: David Fanning on Thu, 06 March 2008 20:04
		Re: how to draw streamline By: mankoff on Thu, 06 March 2008 19:56
		Re: how to draw streamline By: chris_torrence@NOSPAM on Thu, 13 March 2008 13:32
		Re: how to draw streamline By: wfzhao on Sun, 16 March 2008 22:22

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