Column Vector Containing the Row Sums of the Elements of A

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Sophie Culhane 2020-9-23

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评论： Ameer Hamza 2020-9-23

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

Thank you in advance for the help.

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Answer 1

Ameer Hamza 2020-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/598618-column-vector-containing-the-row-sums-of-the-elements-of-a#answer_499204

编辑：Ameer Hamza 2020-9-23

在 MATLAB Online 中打开

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