Find max and min values, seperated by max or min

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FV 2020-4-20

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https://ww2.mathworks.cn/matlabcentral/answers/519244-find-max-and-min-values-seperated-by-max-or-min

评论： KSSV 2020-4-20

I have a large set of numbers and need to find two minimum values and two maximum values. However it shouldn't just be the two absolute max and min values they need to be seperated by a max or min value. So max,min,max,min.

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KSSV 2020-4-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/519244-find-max-and-min-values-seperated-by-max-or-min#answer_427051

编辑：KSSV 2020-4-20

在 MATLAB Online 中打开

Let A be your array.

[val1,idx1] = max(A) ;
A(idx1) = NaN ;
[val2,idx2] = max(A) ; 
if idx1 > idx2 
    [val3,idx3] = min(A(idx2:idx1)) ; 
else
    [val3,idx3] = min(A(idx1:idx2)) ; 
end
[val4,idx4] = min(A(idx2:end)) ; 

Also read about findpeaks. Also you can sort array and get it.

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FV 2020-4-20

no, it won't be any value between them, that's the problem. I want to exlude max values that is beside each other.

I made an example, so if A=[1;3;1.2;1.2;0.7;0.6;0.61;1;4;7;1.2;0.5]; The two max values is beside each other. I don't want that. So instead of 7 and 4 is max I want 7 and 3.

I also want the code to work if they are not beside each other. Just if the two values is next to each other I want to find the next value.

KSSV 2020-4-20

在 MATLAB Online 中打开

clc; clear all ;
A=[1;3;1.2;1.2;0.7;0.6;0.61;1;4;7;1.2;0.5]; 
B = A ;
[val1,idx1] = max(A) ;
A(idx1) = NaN ;
[val2,idx2] = max(A) ; 
while (abs(idx1-idx2)==1)
  A(idx2) = NaN ;
  [val2,idx2] = max(A) ; 
end
if idx1 > idx2 
    [val3,idx3] = min(A(idx2:idx1)) ; 
else
    [val3,idx3] = min(A(idx1:idx2)) ; 
end
[val4,idx4] = min(A(idx2:end)) ; 