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Finding maximum value of y at some x

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RAJAN PRASAD
RAJAN PRASAD on 17 Jun 2016
Edited: Andrei Bobrov on 17 Jun 2016
I have a vector y=[6 8 10 9 11 31] x=[1 2 3 4 5 6] how to find at what x the first maximum value of y occured and the second maxima

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Answers (3)

Roger Stafford
Roger Stafford on 17 Jun 2016
[~,p] = sort(y,descend);
x2 = x(p(1:2)); % <-- x values at first and second maxima of y

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Andrei Bobrov
Andrei Bobrov on 17 Jun 2016
Edited: Andrei Bobrov on 17 Jun 2016
y=[6 8 11 10 31 9 11 31]
x=[3 9 4 1 23 3 2 7]
[a,~,c] = unique(y);
ii = accumarray(c(:),(1:numel(c))',[],@(x){x});
idx = ii([end,end-1]);
out = cellfun(@(a)x(a),idx,'un',0)

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