How to delete max values for every 5 rows

Question

abdullah al-dulaimi 2022-12-29

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1885952-how-to-delete-max-values-for-every-5-rows

编辑： Voss 2022-12-29

I want to delete the max value for column 1 for every 5 rows with idx column 2

The matrix

A =

1 1

2 2

6 3

12 2

4 5

9 6

14 1

5 1

6 9

8 10

11 11

12 3

9 13

4 6

10 15

the result will be

1 1

2 2

6 3

4 5

9 6

5 1

6 9

8 10

11 11

9 13

4 6

10 15

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Answer 1

Voss 2022-12-29

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1885952-how-to-delete-max-values-for-every-5-rows#answer_1138042

编辑：Voss 2022-12-29

在 MATLAB Online 中打开

A = [
     1     1
     2     2
     6     3
    12     2
     4     5
     9     6
    14     1
     5     1
     6     9
     8    10
    11    11
    12    3
     9    13
     4    6
    10    15];
% group size
n = 5;
% index of max value, within each group of n (5)
[~,idx] = max(reshape(A(:,1),n,[]),[],1)
idx = 1×3
     4     2     2
% convert to index in A
rows_to_delete = (0:numel(idx)-1)*n+idx
rows_to_delete = 1×3
     4     7    12
% delete the rows of A
A(rows_to_delete,:) = []
A = 12×2
     1     1
     2     2
     6     3
     4     5
     9     6
     5     1
     6     9
     8    10
    11    11
     9    13