How do I subtract every row of a matrix with every row of a second matrix?
조회 수: 20 (최근 30일)
이전 댓글 표시
Hi,
I have two matrices A (26 rows X 5100 columns) and B (26rows X 5100 columns) and I want to subtract every row of A with every row of B to obtain another matric C (2601 rows X 5100 columns). How can I have the matrix C?
댓글 수: 0
채택된 답변
ChrisR
2021년 10월 25일
Here's how I understood the question. If you have A = magic(3) and B = eye(3)--that is,
A = [8 1 6; 3 5 7; 4 9 2];
B = [1 0 0; 0 1 0; 0 0 1];
then you can subtract the rows of B from each row of A with
m = size(A,1);
C = repelem(A,m,1) - repmat(B,m,1);
This approach gives
C = [7 1 6; 8 0 6; 8 1 5; 2 5 7; 3 4 7; 3 5 6; 3 9 2; 4 8 2; 4 9 1];
But in the example given in the question, this approach would produce a 676x5100 matrix, not a 2601x5100 matrix.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Loops and Conditional Statements에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!