secons max number in a vector

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PChoppala 2011-11-24

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采纳的回答： Rick Rosson

Hi I need to find maximum and second maximum number in a vector. Can you please help?

For max, its max(X), but for second max I am unable to figure out.

Your help is appreciated

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Rick Rosson 2011-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/22204-secons-max-number-in-a-vector#answer_29224

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   a = max(X);
   Y = X(X ~= a);
   b = max(Y);

There are apparently efficient linear-time routines to find the N largest or N smallest numbers in a list, and supposedly they do not need to do a mini-sort of N elements to find the proper place in the list for each new value being tested. I have not yet been able to understand the logic in the paper that describes the internal comparison scheme.

Rick Rosson 2011-11-25