i want to get the max value from a column matrix from a specific no of rows ?

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OMKAR ACHARJEE
OMKAR ACHARJEE 2018-6-6
评论： OMKAR ACHARJEE 2018-6-6
suppose i have a 269712x1 column matrix ,from the matrix i want to find the max value from each 8760 rows and in this way i have to get 1 value from each 8670 rows which are repeated 30 times. How do i proceed?

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monika shivhare
monika shivhare 2018-6-6
编辑：monika shivhare 2018-6-6
Let A is your given data column matrix, and m is matrix of maximums of each 8760 rows
m=zeros(30,1);
for i=1:30
m(i)=max(max(A((i-1)*8760 +1 : i*8760)));
end
We are using max(max()) because max(X) gives row of maximum value of each column. Alternatively, you can use
m=zeros(30,1);
A=A';
for i=1:30
m(i)=max(A((i-1)*8760 +1 : i*8760));
end

更多回答（1 个）

KSSV
KSSV 2018-6-6
A = rand( 269712,1) ; % some random data for demo
% discard extra elements
idx = round(length(A)/8670)*8670 ;
A = A(1:idx) ;
B = reshape(A,8670,[]) ;
iwant = max(B)

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