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Re: Drawing vector fields with New Graphics [message #85087 is a reply to message #85084]

Tue, 02 July 2013 12:08

Gordon Farquharson
Messages: 48
Registered: December 2010

Member

On Tuesday, July 2, 2013 11:15:00 AM UTC-7, Phillip Bitzer wrote:
> On Tuesday, July 2, 2013 12:54:36 PM UTC-5, Gordon Farquharson wrote:
> Chacun a son gout, ...

I have no idea how to pronounce it, but I like it :-)

> Not exactly what I was thinking. Defining v1 sets the "units" of the length_scale. You then set the "unit" to be 2 tics with v1.length_scale=2
>
> If instead of dividing the vx, vy by the magnitude, instead try
>
> v2.length_scale = 2/vmag
>
> I think this is what you're looking for....at least for this example.

Perfect! It works. Thanks very much for the suggestion. For reference (for others), here is the updated program.

PRO test_vector

x = [0.,1.,2.]
y = [0.,0.,0.]
vx = [1.,1.,1.]
vy = [1.,1.,1.]

vmag = mean(sqrt(vx^2 + vy^2))

v1 = vector(vx, vy, x, y, $
XTITLE='X', YTITLE='Y', $
XRANGE=[-1.,4.], YRANGE=[-1.,4.])

v1.arrow_thick = 2
v1.length_scale = 2

x = [1.,2.]
y = [1.,1.]
vx = [-0.5,-0.5]
vy = [-0.5,-0.5]

v2 = vector(vx, vy, x, y, $
/OVERPLOT, XRANGE=[-1.,4.], YRANGE=[-1.,4.])

v2.arrow_thick = 2
v2.length_scale = 2. / vmag

END

Thanks for the help.

(Maybe Mark or Chris could still comment on whether vector could be improved to provide a more intuitive interface.)

Gordon

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[Message index]

		Drawing vector fields with New Graphics By: Gordon Farquharson on Mon, 01 July 2013 14:34
		Re: Drawing vector fields with New Graphics By: Phillip Bitzer on Tue, 02 July 2013 07:31
		Re: Drawing vector fields with New Graphics By: David Fanning on Tue, 02 July 2013 07:38
		Re: Drawing vector fields with New Graphics By: Gordon Farquharson on Tue, 02 July 2013 10:54
		Re: Drawing vector fields with New Graphics By: David Fanning on Tue, 02 July 2013 11:10
		Re: Drawing vector fields with New Graphics By: David Fanning on Tue, 02 July 2013 11:32
		Re: Drawing vector fields with New Graphics By: Phillip Bitzer on Tue, 02 July 2013 11:15
		Re: Drawing vector fields with New Graphics By: David Fanning on Tue, 02 July 2013 11:40
		Re: Drawing vector fields with New Graphics By: Gordon Farquharson on Tue, 02 July 2013 12:08
		Re: Drawing vector fields with New Graphics By: Mark Piper on Thu, 04 July 2013 13:20

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