如何获得阵列的镜像(MATLAB)? [英] How to obtain the mirror image of an array (MATLAB)?
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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 flipdim
,具有相同的调用语法:
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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