How to use the sum function on a matrix to get the sum of the rows not the columns

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daniel adams
daniel adams on 29 Sep 2021
Answered: Steven Lord on 29 Sep 2021
How to use the sum function on an array to get the sum of the rows not the columns :
I want to have an array of the sum of the rows of a matrix ( dimension $nxn$ ). When I use the sum function I get a sum of the columns.
If my matrix is called M the following code gives me what I want
sum_of_the_rows=sum(M')
However, this requires taking a transpose, is there a faster way to do this?

Accepted Answer

Steven Lord
Steven Lord on 29 Sep 2021
Use the dim input argument. See the third example titled "Sum of Matrix Rows" on the documentation page.

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