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How to rotate this 2d matrix with some angle ?

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shubham kumar gupta
shubham kumar gupta el 19 de Nov. de 2022
Comentada: Jan el 20 de Nov. de 2022
I tried to make a mesh using this
z=peaks(100);
// Now z is a 100x100 matrix
Now I want to roatate this in some angle like 5 degress
I tried this for
z = peaks(2);
theta = 5;
R = [cosd(theta) -sind(theta); sind(theta) cosd(theta)];
z1=R*z;
but for z greater than 2x2 not working
this i want

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DGM
DGM el 19 de Nov. de 2022
Editada: DGM el 19 de Nov. de 2022
You'll need more than zdata to rotate the plot. You'll need to define the x and y positions of the points.
If you just want to rotate the plot, you can just use rotate(). It's up to you to pick the view position you want.
[x y z] = peaks(20);
theta = 15;
hs = mesh(x,y,z);
axis equal
% pick some view vector
% [0 1 0] rotation vector is || to y-axis
% [-3 0 0] origin of rotation vector
rotate(hs,[0 1 0],-theta,[-3 0 0])
view([0 -1 0]) % set the view
axis equal
xlabel('x')
% get the rotated data
xr = hs.XData;
yr = hs.YData;
zr = hs.ZData;
  3 comentarios
DGM
DGM el 19 de Nov. de 2022
You can access the XData, etc from the graphics object. I'll update the answer...
shubham kumar gupta
shubham kumar gupta el 19 de Nov. de 2022
Thank you

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Más respuestas (1)

Jan
Jan el 19 de Nov. de 2022
Editada: Jan el 19 de Nov. de 2022
To define a rotation matrix, you need
  • one angle in 2D (rotation around the Z axis)
  • one angle and an axis of rotation in 3D
  • one angle and 2 vectors, which build the plane to rotate in in 4D and higher dimensions. Rotating "around an axis" is not uniquely defined in >= 4D.
  2 comentarios
shubham kumar gupta
shubham kumar gupta el 19 de Nov. de 2022
Editada: shubham kumar gupta el 19 de Nov. de 2022
can you help how to apply value for u,v?
alpha i chose as 5 degree
z is matrix of 25x25
zRotated = RotMatrix(5,1,z);
not working
Jan
Jan el 20 de Nov. de 2022
Please read the documentation of the provided command: help RotMatrix. The input (5,1,z) are not meaningful. The angle is provided in radians, not degrees. With 3 inputs, you ask for a rotation matrix in a higher dimensional case. Then the 2nd and 3rd argument are two vectors which span the plane to rotate in.
I cannot suggest values vor u and v as long as you do not define the plane to rotate in. But I think, you do not want to rotate in a 25-dimensional space, but still in 2D.

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