how to remove some row or column of a matrix at once?

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eri
eri 2012-11-6
lets say i have a 100x100 matrix and i want to remove row 71-100 so it become 100x70 matrix

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回答（2 个）

Arthur
Arthur 2012-11-6
编辑：Arthur 2012-11-6
a = zeros(100,100); %create 100x100 matrix
a(71:100,:) = []; %remove rows 71:100
Sean de Wolski
Sean de Wolski 2012-11-6
Note you say row but the new size of your matrix removed columns
Here are two ways to remove columns:
x = x(:,1:70); %glass half full
or
x(:,71:end) = []; %glass half empty

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