Rotating a Vector

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A
A 2011-7-8
评论： James Tursa 2020-4-16
Hello! I am wondering if anyone has an elegant way to rotate a vector by a specified degree.
For example, I have a vector that goes from (0,0) to (-1,-12). I want to rotate this vector by 5 degrees, incrementally until it reaches the x-axis.
Obviously this can be done from the math, but I wonder if anyone has a nicer way of doing this.
Thank you in advance!
Amina

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2011-7-8
complex
vR = v*[1;1i]*exp(-1i*theta*pi/180)
  2 个评论
A
A 2011-7-20
Very nice, thanks!
The only problem that I am having is using vR as it is a 1x1 element and therefore not in usual vector form. Is there a way that I can mash this into that form?
James Tursa
James Tursa 2020-4-16
real(vR) are the x components of the vectors, and imag(vR) are the y components of the vectors.

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更多回答（3 个）

Sean de Wolski
Sean de Wolski 2011-7-8
Unless I'm missing something just use the rotation matrix:
v = [-1 -12];
theta = 5;
R = [cosd(theta) -sind(theta); sind(theta) cosd(theta)];
vR = v*R;
quiver(0,0,v(1),v(2))
hold on
quiver(0,0,vR(1),vR(2))
Sayyed Ahmad Khadem
Sayyed Ahmad Khadem 2018-12-26
Hi all,
I read this blog, and I have similar problem. I would be thankful to kindly give me some clues if you know.
Suppose that we have a vector field in y-x plane, let's consider following example:
Vector Field : Vf = [u, v]
u=x
v=y
Untitled.png
Now, I need to revolve the given vector field around the center of plot (i.e. [0 0]). Does anyone can provide some nice solution?
Thanks in advance,
  1 个评论
Adam Danz
Adam Danz 2020-4-16
You can use quiverRotate() from the file exchange.
You can flip the direction of the quiver arrows by using the quiver handle or by flipping the vector component prior to producing the quiver plot.
h = quiver(x,y,u,v);
quiverRotate(h)
% or
[Ur,Vr] = quiverRotate(u,v);
quiver(x,y,Ur,Vr)

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wenhao li
wenhao li 2019-1-11
Have you solved this problem? I met this problem, too.
  1 个评论
Sayyed Ahmad Khadem
Sayyed Ahmad Khadem 2019-1-11
Hi Wenhao,
No one has suggested a viable approach yet ! :-( I am still struggling !

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