Matrix Multiplication by a vector of Ones - How to write mathematically
4 views (last 30 days)
Show older comments
Hi,
During my calculations I come at a point where I multiply say 9x9 matrix by a column vector containing ONEs of size 9x1. Definitely, it returns me a vector of 9x1 with all columns summed into single element.
What is such process called mathematically and how to write it in notation?
I will grateful for the help.
Best regards, Rehan
0 Comments
Answers (2)
John D'Errico
on 1 Jun 2017
What is it called? A sum.
help sum
Or if you insist on doing it as a multiply, then
help ones
help mtimes
0 Comments
Christoph F.
on 1 Jun 2017
That is just a regular matrix multiplication, with the second "matrix" having only one column.
See Also
Categories
Find more on Linear Algebra in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!