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How to draw a 2-D arrow [1,2] at point [3,4]? [message #66237]

Mon, 27 April 2009 17:39

litongmu
Messages: 7
Registered: October 2008

Junior Member

Hi all,

I am trying to draw 2-D arrows like a arrow with length 1 in the
positive x direction and length 2 in the positive y direction starting
at the point (3,4), which is just a feather plot or quiver plot. But I
do not know how to do that in IDL. I tried the VEL, and VELOVECT
commands, but to be honest, I do not get the point of these commands.
I really do not understand why the parameters in these commands have
to be 2-D arrays. And I really hope someone could save me here.
Thanks in advance.

-Tongmu

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