MATLAB: Flip certain columns in matrix

columnsflipmatrix

hey all i need to flip every nth column in a matrix. ie. if i have matrix A=[1 2 3;4 5 6;7 8 9] i need it to become A=[1 8 3;4 5 6;7 2 9] any suggestions?

Best Answer

n = 2;  
colIdx = 2:n:size(A,2);
A(:,colIdx) = flip( A(:,colIdx) )
assuming you want to flip even columns (in the case of n = 2). Obviously for odd colums just change the first line to:
colIdx = 1:n:size(A,2);
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