Sum matrix column orderly

Dear all, I have a matrix A(1022*100) now. I want to make a matrix B, which column will be follow by these rules: (1) Matrix B column 1 will be sum (1-15)column in matrix A. (2)B column 2 will be sum (2-16)column in matrix A.etc. Examples: matrix example_matrix[1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16] ,sum 3 matrix columns orderly and put all the answers in to new matrix. (Answers_matrix column 1:[1+5+9,2+6+10,3+7+11,4+8+12] column 2:[5+9+13,6+10+14,7+11+15,8+12+16])Final_matrix:[15,18,21,24;27,30,33,36] thank you for your help!! I am appreciate it!!

Answer 1

[Voss]

This will work for your example_matrix:

Final_matrix = movsum(example_matrix,3,1,'Endpoints','discard');

Maybe doing the same but with 15-point moving sum instead of 3-point is what you have in mind for the matrix A.

Answer 2

[Awais Saeed]

chnage first_row and end_row according to your requirement

A = [1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16]

A = 4×4

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

start_row = 1;
end_row = 3;

for row = 1:1:size(A,1)
    for col = 1:1:size(A,2)
        M(row,col) = sum(A(start_row:end_row,col));
    end
    start_row = start_row + 1;
    end_row = end_row + 1;
    if (end_row > size(A,2))
        break;
    end
end
disp(M)

    15    18    21    24
    27    30    33    36

Answer 3

[Matt J]

B=conv2(A,ones(15,1),'valid').';