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

Question

OMKAR ACHARJEE 2018-6-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/404253-i-want-to-get-the-max-value-from-a-column-matrix-from-a-specific-no-of-rows

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?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

monika shivhare 2018-6-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/404253-i-want-to-get-the-max-value-from-a-column-matrix-from-a-specific-no-of-rows#answer_323412

编辑：monika shivhare 2018-6-6

在 MATLAB Online 中打开

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

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

OMKAR ACHARJEE 2018-6-6

thanks...you just saved my life

请先登录，再进行评论。

Answer 2

KSSV 2018-6-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/404253-i-want-to-get-the-max-value-from-a-column-matrix-from-a-specific-no-of-rows#answer_323415

在 MATLAB Online 中打开

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)