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

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?

Answer 1

[monika shivhare]

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

[OMKAR ACHARJEE]

thanks...you just saved my life

Answer 2

[KSSV]

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)