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How to adjust matrix

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Sharanya
Sharanya 2022-12-12
评论： Voss 2022-12-13
I have a 21x21 matrix. I want to remove the first two colums and rows, and the 11th and 12th columns and rows (resulting in a 17x17 matrix). How should I do this?

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回答（1 个）

Walter Roberson
Walter Roberson 2022-12-12
tokeep = [3:10, 13:21];
B = A(tokeep, tokeep);
or
B = A;
B(:,11:12) = []; B(11:12,[]) = [];
B(1:2,:) = []; B(:,1:2) = [];
Always delete the higher-index before the lower index.
  1 个评论
Voss
Voss 2022-12-13
Or delete all indices at once:
B = A;
B(:,[1 2 11 12]) = [];
B([1 2 11 12],:) = [];

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