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 2021-9-29

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回答： Steven Lord 2021-9-29

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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?

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Steven Lord 2021-9-29

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

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