如何获取阵列的镜像(MATLAB)？

Question

给定一个数组:

array1 = [1 2 3];

我必须这样扭转它:

array1MirrorImage = [3 2 1];

到目前为止,我获得了这个丑陋的解

array1MirrorImage = padarray(array1, [0 length(array1)], 'symmetric', 'pre');
array1MirrorImage = array1MirrorImage(1:length(array1));

有更漂亮的解决方案吗？

Answer 1

更新:在较新版本的MATLAB(R2013b及更高版本)中,最好使用函数flip代替flipdim,它具有相同的调用语法:

a = flip(a, 1);  % Reverses elements in each column
a = flip(a, 2);  % Reverses elements in each row

托马斯有正确的答案.要添加一点,您还可以使用更一般的flipdim:

a = flipdim(a, 1);  % Flips the rows of a
a = flipdim(a, 2);  % Flips the columns of a

另外一个小技巧......如果由于某种原因你必须翻转2-D数组的两个尺寸,你可以调用flipdim两次:

a = flipdim(flipdim(a, 1), 2);

或致电rot90:

a = rot90(a, 2);  % Rotates matrix by 180 degrees

Answer 2

另一个简单的解决方案

b = a(end:-1:1);

您也可以在特定维度上使用它.

b = a(:,end:-1:1); % Flip the columns of a

Answer 3

您可以使用

rowreverse = fliplr(row) %  for a row vector    (or each row of a 2D array)
colreverse = flipud(col) % for a column vector (or each column of a 2D array)

genreverse = x(end:-1:1) % for the general case of a 1D vector (either row or column)

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