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Hi there,

I am seeing a lot of information about the quiverm function but I only have my wind direction data in degrees and not in the u and v components. Is there a simple way to project a matrix of wind direction values (360 degrees) onto a sufacem plot? Perhaps there is a way to add and arrow and align it based on the wind direction value? I do not want to add magnitude as well, just direction.

Many thanks,

Kirby Fears
on 23 Sep 2015

-179 is the correct answer.

-179+360=181

The NCL website adds 180 to this, which would be

-179+180=1, which is incorrect.

Kirby Fears
on 23 Sep 2015

Edited: Kirby Fears
on 23 Sep 2015

I'm posting an example as described in my earlier comment.

Code below creates a 10x10 grid of arrows that are all pointing at 120 degrees.

x=repmat(1:10,10,1);

y=x';

deg=120; % all points have same direction

% if you have a degree array the same size as x,

% you can use cosd and sind on "deg" without

% using repmat after

u=repmat(cosd(deg),size(x));

v=repmat(sind(deg),size(x));

% you can multiply u and v by magnitude of required

quiver(x,y,u,v);

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