I have a matrix. I can't figure out how to subtract row 1 from row 5, row 2 from row 6, row 3 from row 7, row 4 from row 8. My code isn't working.

8 views (last 30 days)
A = [2.5 3.5 7.5 8.5 ;... %1
9.5 5.5 6.5 1.5;... %2
2.5 3.5 7.5 8.5; ... %3
9.5 5.5 6.5 1.5;... %4
2.5 3.5 7.5 8.5; ... %5
9.5 5.5 6.5 1.5;... %6
2.5 3.5 7.5 8.5;... %7
9.5 5.5 6.5 1.5]; %8
for i=1:size(A,1)
for j=1:size(A,1)/2
tmp(i,:) = A(i,:)-A(j,:)
end
% tmp(i,:) = A(i,:)-A(4+j,:)
end
My code is not working very well. I need a loop that can work for any matrix size.

Accepted Answer

TADA
TADA on 18 Sep 2021
if the functionality is to subtract the row in index n+4 from the row in index n
A = [2.5 3.5 7.5 8.5 ;... %1
9.5 5.5 6.5 1.5;... %2
2.5 3.5 7.5 8.5; ... %3
9.5 5.5 6.5 1.5;... %4
2.5 3.5 7.5 8.5; ... %5
9.5 5.5 6.5 1.5;... %6
2.5 3.5 7.5 8.5;... %7
9.5 5.5 6.5 1.5]; %8
subtractInterval = 4;
tmp = A(1:end-subtractInterval, :) - A(subtractInterval+1:end, :)
size(tmp)
A = magic(10);
tmp = A(1:end-subtractInterval, :) - A(subtractInterval+1:end, :)
size(tmp)

More Answers (0)

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Products

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!