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convert specific vector to vector in one direction

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muhammad ismat
muhammad ismat 2016-2-19
回答： muhammad ismat 2016-2-19
if i have av=[1 2;3 4;2 1;4 3] and i want the result a=[1 2;3 4]

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回答（3 个）

James Tursa
James Tursa 2016-2-19
编辑：James Tursa 2016-2-19
a = av(1:2,1:2);
If this simple solution is not what you are looking for then please give more details in your question.
Based on your reply it looks like you simply want the top half of your matrix. So try this:
[m n] = size(av);
a = av(1:(m/2),:);
muhammad ismat
muhammad ismat 2016-2-19
i have a vector as av=[1 2;5 6;7 8;4 3;9 8;6 7;2 1;6 5;8 7;3 4;8 9;7 6] i want to a=[1 2;5 6;7 8;4 3;9 8;6 7]
muhammad ismat
muhammad ismat 2016-2-19
that's right , thank you very much

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