vector multiplied a matrix
조회 수: 3 (최근 30일)
이전 댓글 표시
Hi, I need this multiplication and I can't whats wrong
f=c.*T
where c and T are the attached files.
so I expect a raw vector f where:
f_11 = c_11*T_11 + c_12*T_21 + c_13*T_31 + c_14*T_41 + c_15*T_51;
f_12= c_11*T_12 + c_12*T_22 + c_13*T_32 + c_14*T_42 + c_15*T_52;
and so on.
It's really stupid i know, but I can''t figured out why it's not working.
c has 1 colum and 5 rows, T has 101 colums and 5 rows.
댓글 수: 4
James Tursa
2020년 6월 11일
Your notation is confusing. You say c has 5 rows and 1 column, yet you use c_12 in your example indicating it has 1 row and 5 columns.
채택된 답변
James Tursa
2020년 6월 11일
편집: James Tursa
2020년 6월 11일
Maybe this is what you want if c is 5 x 1 and T is 5 x 101:
f = c.' * T;
댓글 수: 0
추가 답변 (1개)
the cyclist
2020년 6월 11일
If your version of MATLAB is older than R2016b, then c will not be "implicitly expanded" to the size of T. You can do the following to get what you want:
f = bsxfun(@times,c,T)
댓글 수: 2
the cyclist
2020년 6월 11일
Sorry, I missed that you wanted the sum. What you want is actually a matrix multiplication, not an element-wise multiplication, which is the syntax you were trying to use. I think you want this:
f = T'*c;
참고 항목
카테고리
Help Center 및 File Exchange에서 Matrices and Arrays에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!