Column Vector Containing the Row Sums of the Elements of A

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My task is to write a MATLAB function that takes as input a nonemty 2-dimensional array A and returns a column vector containing the row sums of the elements of A. I have a program written out, however it calculates and sum of all elements and puts them in a column vector. Please help me figure out how to only add the elements of one row and continue with the next. Here is what I have so far:
function RowSum = ex(A)
%
%
[NRows, NCols] = size(A);
RowSum = zeros(NRows, 1);
for row = 1: NRows
for col = 1: NCols
RowSum = RowSum + A(row, col);
end
end
Thank you in advance for the help.

Accepted Answer

Ameer Hamza
Ameer Hamza on 23 Sep 2020
Edited: Ameer Hamza on 23 Sep 2020
Why not use the builtin function
M = rand(10, 5);
M_sum = sum(M, 2)
As for your current code, the correct is
function RowSum = ex(A)
%
%
[NRows, NCols] = size(A);
RowSum = zeros(NRows, 1);
for row = 1: NRows
for col = 1: NCols
RowSum(row) = RowSum(row) + A(row, col);
end
end

More Answers (2)

madhan ravi
madhan ravi on 23 Sep 2020
doc sum

Alan Stevens
Alan Stevens on 23 Sep 2020
Matlab has the function "sum". Try help sum.

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