Arrows of the same length in a quiver plot

Hello,

I know that vectors can be superimposed over a curve using quiver (dx, dy, du, dw, scale). I am only interested in keeping the angle and prefer to have vectors with the same length. I am wondering how I can have vectors with the same length. I have used (dx, dw, du, dw, 1/(du^2+dw^2)) to create the equal length but the length of vectors are still different!

Cheers,

Cyrus

Answer 1

[Michael Haderlein]

Scale is not the right parameter for your purpose. You need to normalize the velocity:

 un=du./sqrt(du.^2+dw.^2);
 wn=dv./sqrt(du.^2+dw.^2);
 quiver(dx,dy,un,wn)

Best regards,

Michael

[Kourosh]

Great, thank you.

Regards,

Cyrus

[David Martin]

Why doesn't this work for me? I have the following code and the arrows come out with different lengths.

t = 0:0.5:5;

v = -5:0.5:5;

[T,V] = meshgrid(t,v);

dT = 0.05 + 0.0*T;

dV = (2+V).*dT;

dR = sqrt(dT.^2 + dV.^2);

dT = dT ./ dR;

dV = dV ./ dR;

quiver(T,V,dT,dV,'Linewidth',2);

Any help would be appreciated.