Matrix Multiplication by a vector of Ones - How to write mathematically
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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