Write a function called sum_rows
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Write a function called sum_rows that takes a matrix as input argument
(the function does not have to check the format of the input) and returns
a vector as an output argument. The elements of the vector are the
sums of the elements of the rows of the input matrix. Note that the built-in
MATLAB function sum returns the sum of the columns.
回答（1 个）
Abolfazl Chaman Motlagh
2021-12-5
sum function get dim (dimension which summuation operate on it) as second arguments.
so just use :
sum(A,2)
a function :
function x=sum_(A)
x=sum(A,2);
end
2 个评论
Let us test:
A = [1 2 3; 4 5 6]
sum_(A)
function x=sum_(A)
x=sum(A,2);
end
Was a vector returned? Yes.
Does the vector equal the sum of the rows? Yes.
Is the function named sum_rows? No.
Is it reasonable to expect that volunteers will give exact solutions to homework questions? No.
Is it reasonable for a volunteer to show the technology the poster needs, assuming that the poster will adapt the ideas and use them as needed? Yes.
John D'Errico
2021-12-5
编辑：John D'Errico
2021-12-5
Please do not do student homework assignments for them. This does not help the student, even if they seem grateful. All the student learns is they can use Answers as a way to do their homework for them. I would point out that the poster has posted two obvious homework assignment questions. (I closed the other.) If not discouraged, they will continue to post their entire assignments.
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2021-12-5
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