To find Maximum value and minimum value for each group of four rows for a 180*1 matrix

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Joydeb Saha 2021-7-27

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回答： KSSV 2021-7-27

Say I have a 180x1 matrix. I have to find the max and min value of each 12 rows. e.g, max min value of 1-12th row and 13th to 24th row and so on..

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Answer 1

KSSV 2021-7-27

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A = rand(180,1) ; 
B = reshape(A,12,[])' ;
themax = max(B) ;
themin = min(B) ; 

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Answer 2

Rik 2021-7-27

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在 MATLAB Online 中打开

Easy if you reshape the vector to an array:

data=rand(180,1);
data_=reshape(data,12,[]);
max(data_,[],1)
ans = 1×15
    0.9353    0.9149    0.8658    0.9909    0.9962    0.9774    0.9912    0.9617    0.9288    0.8957    0.9471    0.8812    0.9200    0.8054    0.8691
min(data_,[],1)
ans = 1×15
    0.0552    0.0024    0.0409    0.0265    0.0392    0.0085    0.0041    0.0097    0.2144    0.0208    0.0942    0.1048    0.1427    0.0291    0.0015