Selection of 3 large value from a matrix

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Tinkul
Tinkul 2014-4-7
评论： Tinkul 2014-4-7
How can i select 3 largest value from a matrix and remaining make zero without changing the dimension,For eg A=[1 3 5 8 31 7 4 18] The output should be A=[0 0 0 8 31 0 0 18] Please help

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Azzi Abdelmalek
Azzi Abdelmalek 2014-4-7
编辑：Azzi Abdelmalek 2014-4-7
A=[1 3 5 8 31 7 4 18]
[ii,jj]=sort(A,'descend');
A(jj(4:end))=0
Or
A=[1 3 5 8 31 7 4 18]
[ii,jj]=sort(A,'descend');
B=zeros(size(A))
B(jj(1:3))=A(jj(1:3))

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