Rotate matrix with interp2

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Sung YunSing
Sung YunSing 2019-11-11
评论： Sung YunSing 2019-11-14
I am trying to rotate a matrix to a specific direction(vector) by using interp2.
I input Matrix and a vector.
Matrix will be the object I want to rotate(2-D matrix of nxm).
The direction which i want to rotate to will be shown as a (unit) vector.
The vector will need to be a 2x2 matrix.
The first column will be the vector of direction and the second column will be the orthogonal vector of the first.
The logic of what I want to do is like doing a rotation matrix on Cartesian coordinate system, but the sin and cos will be replaced as a unit vector.
But what I get is just a matrix full of NaN.
function [Mq]=Rotation(Matrix,vector)
ly=length(Matrix(:,1));
lx=length(Matrix(1,:));
x=1:lx;
y=1:ly;
[X,Y]=meshgrid(x,y);
Xq=X*vector(1,1)-Y*vector(2,1);
Yq=X*vector(1,2)+Y*vector(2,2);
Mq=interp2(X,Y,Matrix,Xq,Yq);
end
  2 个评论
darova
darova 2019-11-11
Maybe you didn't define ph?
darova
darova 2019-11-12
I think you trying to extrapolate values
123.png

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采纳的回答

Matt J
Matt J 2019-11-12
This might be what you want.
[X,Y]=meshgrid(x-mean(x),y-mean(y));

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