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Re: plot tangentail vector [message #58078 is a reply to message #58032]

Wed, 16 January 2008 05:44

JMB
Messages: 13
Registered: January 2008

Junior Member

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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