| Re: how to draw streamline [message #59141] |
Tue, 11 March 2008 10:25  |
mankoff
Messages: 131
Registered: March 2004
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Senior Member |
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On Mar 7, 12:06 am, David Fanning <n...@dfanning.com> wrote:
> mankoff writes:
>> The thunderstorm demo has code to calculate streamlines from u,v,w.
>
> I thought so, too. But I played with it for 15 minutes
> and didn't get anything like streamlines to appear,
> so perhaps you have to be more intuitive than me to
> see them. :-)
>
I double-tap on my MacBook touchpad. I think this is a right-click? Do
it on one of the image planes and you get "Ribbons" which are
streamlines + extra information.
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| Re: how to draw streamline [message #59186 is a reply to message #59141] |
Fri, 07 March 2008 05:55  |
Kenneth P. Bowman
Messages: 585
Registered: May 2000
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Senior Member |
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In article
<92bef8cb-bd54-48b7-b54c-2ff9f4f75bf7@s8g2000prg.googlegroups.com>,
wenfang_zhao@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
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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
Messages: 528
Registered: March 2007
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Senior Member |
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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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| Re: how to draw streamline [message #59309 is a reply to message #59246] |
Sun, 16 March 2008 22:22 |
wfzhao
Messages: 11
Registered: March 2008
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Junior Member |
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On 3月14日, 上午4时32分, Chris Torrence <gorth...@gmail.com> wrote:
> 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- 隐藏被引用文字 -
>
> - 显示引用的文字 -
thanks for all response from you.
now I am a litttle comfused, what kind of line can be called as wind
streamline?
what I want is the consecutive line with arrow, something like the
contour plot line with arrow, not the small lines with arrow,I don't
know how to describe it more clear? I have a sample image of wind
streamline ,which is what I want, but how I can put it on the forum so
all of you can have a look and understand what I mean.
I have another question, when drawing a wind streamline, so the speed
of X,Y direction will decide the final appearance of wind streamline?
I menn, if wind is strong, so the result will be the contour plot line
with arrow(long streamline,consecutive), otherwise, the result will be
the discrete lines with arrow(shorted streamline, like what is draw by
the VEL procedure)?
wenfang
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