Finding maximum value of y at some x

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RAJAN PRASAD
RAJAN PRASAD 2016-6-17
编辑： Andrei Bobrov 2016-6-17
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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回答（3 个）

Roger Stafford
Roger Stafford 2016-6-17
[~,p] = sort(y,’descend’);
x2 = x(p(1:2)); % <-- x values at first and second maxima of y
KSSV
KSSV 2016-6-17
Andrei Bobrov
Andrei Bobrov 2016-6-17
编辑：Andrei Bobrov 2016-6-17
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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