"Using MATLAB Write a function that Calculates the overall sum of the elements in each row of a Matrix and also shows on the screen (Not: prints the sum of only the positive numbers from each row)" How can I apply the note to the code?

I have a question like "Using MATLAB Write a function that Calculates the overall sum of the elements in each row of a Matrix and also shows on the screen (Not: prints the sum of only the positive numbers from each row)" and I wrote the code but I did not understand how to apply note to the code.

row = input('Enter number of rows: ');
col = input('Enter number of columns: ');
A = zeros(row+1,col+1);
for i = 1:row
  for j = 1:col
    str = ['Enter element in row ' num2str(i) ', col ' num2str(j) ': '];
    A(i,j) = input(str);
  end
end
fprintf('

A;
A(end,1:col) = sum(A(1:row,1:col),1);
A(1:row,end) = sum(A(1:row,1:col),2);

[Rik]

This time I edited your question for you. Next time, please use the tools explained on this page to make your question more readable. You should also probably fix the syntax errors.

[Stephen23]

http://web.archive.org/web/20210105195932/https://www.mathworks.com/matlabcentral/answers/709353-using-matlab-write-a-function-that-calculates-the-overall-sum-of-the-elements-in-each-row-of-a-matr

Answer 1

[Daniel Catton]

This is my understanding of the question:

A = rand(15,13); %Can set to whatever matrix you wish
[row,col] = size(A); %Counts how many rows and cols in the matrix
b = 0;
B = zeros(row,1); %Preallocates B for speed (probably not necessary in this case but good practice to do so)
for i = 1:row
    for j = 1:col
        a = A(i,j); %Goes through each element in the row
        if a > 0
            b = b+a; %If a is positive then it is added to b
        end
    end
    B(i,1) = b; %b is displayed in the matrix B
    b = 0;
end

[Quietuss Yuroka]

I think I did not express it clearly. Or I did not understand the answer well. Sorry for this and thank you for the answer btw. The only thing here we need to change is rand func. Because in question I did not clarify it but we will define the elements of matrix as user. For example,

I am going to define a 3,3 matrix,

then ı am going to define its elemnts [3,4,5,3,2,12,4,56,-2] like that,

then there is 3 rows like

3 4 5

3 2 12

4 56 -2

program will output the sums of each rows like

12

17

60

as you can see ı did not add the -2 to the sum

that is like a pseudocode hope it helps.

[Daniel Catton]

That is what I mean by saying you can set A to whatever matrix you need. If you are unsure how to type martices into MATLAB then i would recommend looking here. In the example you have given, you will just need to change the first line of my code above (to what I have put below) and that should give you your desired output.

A = [3,4,5;3,2,12;4,56,-2];

[Rik]

@Daniel, please refrain from giving complete solutions to homework problems. That only encourages cheating and means that you will be asked to do their homework next time as well.

[Quietuss Yuroka]

That is not I was trying to do actually. I had just start matlab and just trying to understand question. My apologies if I misunderstood.