flip certain columns in matrix

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john creighton
john creighton 2014-10-20
评论： Adam 2017-12-11
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?

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采纳的回答

Adam
Adam 2014-10-20
编辑：Adam 2014-10-20
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);

更多回答（1 个）

raja bala
raja bala 2017-12-10
A(:,[2]) = flip (A(:,[2]))
  1 个评论
Adam
Adam 2017-12-11
This flips the 2nd column only, as does
A(:,2) = flip (A(:,2))
without the square brackets.

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