Largest column of a matrix

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Omar
Omar 2021-6-4
评论： Omar 2021-6-4
Given an m by n matrix, the e. g. A=[3, 1,2;3,1,1;3,6,2] I want write a Matlab function that finds which of the collumn of A has the highest norm and returns it. This is my attempt
function v=maxivect(A)
[m, n] =size(A);[i, j] =find(ismember(A, ceilmax((normvector(A, inf))) )); v=A(:,j);
end
Instead of getting back the vector having the maximum norm, mostly it returns empty vector while it is not. It works fine with example above but not all, for example if A=rand(3)

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采纳的回答

dpb
dpb 2021-6-4
Try
function v=maxivect(A)
[~,ix]=max(arrayfun(@(i) norm(A(:,i)),[1:size(A,2)]));
v=A(:,ix);
end

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