Question

Given an array:

array1 = [1 2 3]; 

I have to reverse it like so:

array1MirrorImage = [3 2 1]; 

So far I obtained this ugly solution:

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

Is there a prettier solution to this?

Answer 1

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 

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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 

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); 

or call rot90:

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