how to delete columns from matrix

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kmla
kmla 2018-3-3
评论： kmla 2018-3-3
i have matrix (2,n) i want to delete the columns that contain a value < 20 from the two rows for exmple: a=[3 4 7 20 35 40; 29 70 5 90 45 2] the output a=[20 35; 90 45] i tried this code but not work correctly
if true
% code
end
a=[3 4 7 20 35 40; 29 70 5 90 45 2]
for i=1:size(a,1)
for j=1:size(a,2)
if (a(i)<20)
a(:,i)=[];
end
end
end

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采纳的回答

David Fletcher
David Fletcher 2018-3-3
a(:,all(a>=20))
  1 个评论
kmla
kmla 2018-3-3
thank you sir, this also work
for i= size(a, 2):-1:1
a(:, a(1, :) < 20) = []
a(:, a(2, :) < 20) = []
end

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