如何获得阵列的镜像(MATLAB)? [英] How to obtain the mirror image of an array (MATLAB)?

问题描述

给出一个数组:

array1 = [1 2 3];

我必须像这样扭转它:

array1MirrorImage = [3 2 1];

到目前为止，我已经获得了这个丑陋的解决方案:

So far I obtained this ugly solution:

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

有没有更漂亮的解决方案?

Is there a prettier solution to this?

推荐答案

更新:在较新版本的MATLAB(R2013b及更高版本)中，首选使用函数

UPDATE: In newer versions of MATLAB (R2013b and after) it is preferred to use the function flip instead of flipdim, which has the same calling syntax:

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

Tomas的答案正确.要添加一点，您还可以使用更通用的 flipdim :

Tomas has the right answer. To add just a little, you can also use the more general flipdim:

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

另一个小技巧...如果出于某种原因必须翻转二维数组的两个维，则可以两次调用 flipdim :

An additional little trick... if for whatever reason you have to flip BOTH dimensions of a 2-D array, you can either call flipdim twice:

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

或致电 rot90 :

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

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