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Re: How to draw a 2-D arrow [1,2] at point [3,4]? [message #66236]

Mon, 27 April 2009 18:45

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Li, Tongmu writes:

> 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.

I'd try using ARROW. That usually works. :-)

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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