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Re: plot tangentail vector [message #58192 is a reply to message #58078]

Fri, 18 January 2008 21:58

nakisa
Messages: 24
Registered: June 2007

Junior Member

hi Jerome
thanks but it isn't what I need. i want at each position (x,y) it
suppose a circle and plot a tangential vector with given magnitude !!!
nakisa

On Jan 16, 4:44 pm, JMB <jmb.lo...@gmail.com> wrote:
> Does this short example help you?
>
> N = 200
> X = FINDGEN(N)
> Y = 10*SIN(x/16)-10*COS(x/8+2)
> A = abs(16*SIN(x[1:N-2]/4.))
>
> PLOT, X, Y
>
> vx=X[2:N-1]-X[1:N-2]
> vy=(Y[2:N-1]-Y[0:N-3])/2.
>
> Norm=A/sqrt(vx^2+vy^2)
>
> ARROW,X[1:N-2],Y[1:N-2],X[1:N-2]+Norm*vx,Y[1:N-2]+Norm*vy,/
> DATA,color=220
> PLOT, X, Y, /noerase
>
> END
>
> Regards,
>
> Jérôme

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[Message index]

		plot tangentail vector By: nakisa on Sat, 12 January 2008 21:41
		Re: plot tangentail vector By: JMB on Wed, 16 January 2008 05:44
		Re: plot tangentail vector By: nakisa on Fri, 18 January 2008 21:58
		Re: plot tangentail vector By: Spon on Wed, 16 January 2008 05:19

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