MATLAB 中的数组旋转

Question

在 MATLAB 中，有没有办法将数组的元素旋转到另一个维度，例如：

y=[-1,0,1] -->  y=[-1; 0; 1] (like transpose)

y=[-1,0,1] -->  y(:,:,1)=-1, y(:,:,2)=0, y(:,:,3)=1 

y=[-1,0,1] -->  y(:,:,1,1)=-1, y(:,:,1,2)=0, y(:,:,1,3)=1

我想避免 for 循环。

Answer 1

您可以使用转置（函数RESHAPE，或函数 排列。例如：

y = [-1 0 1];               %# Your 1-by-3 sample array

y2 = y.';                  %'# Transposing y gives you a 3-by-1 array
y2 = reshape(y,[3 1]);      %# This also gives you a 3-by-1 array
y2 = permute(y,[2 1]);      %# This also gives you a 3-by-1 array

y3 = reshape(y,[1 1 3]);    %# This gives you a 1-by-1-by-3 array
y3 = permute(y,[3 1 2]);    %# This also gives you a 1-by-1-by-3 array

y4 = reshape(y,[1 1 1 3]);  %# This gives you a 1-by-1-by-1-by-3 array
y4 = permute(y,[4 1 2 3]);  %# This also gives you a 1-by-1-by-1-by-3 array

Answer 2

虽然 reshape 和 permute 是更强大的工具，但您可以使用以下方法轻松解决给定的示例：

y = [-1 0 1];
y2(:,1)=y;
y3(1,1,:)=y;
y4(1,1,1,:)=y;