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

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?

Answer 1

[Steven Lord]

Use the dim input argument. See the third example titled "Sum of Matrix Rows" on the documentation page.