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function odd_index
M=rand(3,4)
N=M(1:2:end,1:2:end)
end
ÃüÁîÐд°¿Ú£º
>> odd_index

M =

    0.3159    0.7437    0.8072    0.5656
    0.9908    0.7009    0.2962    0.4530
    0.6301    0.1598    0.0819    0.8007


N =

    0.3159    0.8072
    0.6301    0.0819
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