Sum using for loop

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Yadu Bhusal
Yadu Bhusal on 14 Aug 2021
Edited: Sulaymon Eshkabilov on 15 Aug 2021
I want to get total sum of two arrays using for loop. I have made the one but it didn't give expected result. Also i want to multiply these array to get final result. And want to arrange sum and product of two array in a table. Appreciate any help on how to that make using for loop.
  2 Comments
the cyclist
the cyclist on 14 Aug 2021
Please paste the code here, rather than an image of the code.
Image Analyst
Image Analyst on 14 Aug 2021
Why do you have a nested for loop for 1-D vectors? All you need is one for loop. Post the code, not an image, after you read this:

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Answers (2)

Awais Saeed
Awais Saeed on 14 Aug 2021
I highly recommend that you go through the link that @Image Analyst shared. Moreover, for adding elements of two arrays (that's what I understood) you can do the following
x = input('Enter your first array: ');
y = input('Enter your second array: ');
sum_array = zeros(size(x)); % pre-allocation
for col = 1:1:size(x,2)
sum_array(col) = x(col) + y(col);
end
disp(['sum = ',num2str(sum(sum_array))])
For multiplication, use
x.*y % element-wise multiplication
  2 Comments
Sulaymon Eshkabilov
Sulaymon Eshkabilov on 14 Aug 2021
@Awais Saeed. Note that the length of x and y are different and thus, your proposed loop does not work.
Awais Saeed
Awais Saeed on 14 Aug 2021
@Sulaymon Eshkabilov yes you are right. From the picture I assumed that x and y have same length and I wrote the loop for that paticular case.

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Sulaymon Eshkabilov
Sulaymon Eshkabilov on 14 Aug 2021
Edited: Sulaymon Eshkabilov on 15 Aug 2021
In your code, there is an err inside a loop, and here is the correction;
...
% E.g. X and Y can be a row or column vector of any length
...
sum_X=0;
sum_Y=0;
for ii=1:length(X)
sum_X = sum_X+X(ii);
end
for jj=1:length(Y)
sum_Y = sum_Y+Y(jj);
end
sum_XY = sum_X+sum_Y;
fprintf('Total sum: SUM_XY = %f', sum_XY)
% Most correct way is:
sum_X = sum(X);
sum_Y = sum(Y);
sum_XY=sum_X+sum_Y;
% or even more compact one:
sum_XY = sum(X)+sum(Y);
fprintf('Total sum: SUM_XY = %f', sum_XY)
  5 Comments
Yadu Bhusal
Yadu Bhusal on 14 Aug 2021
Thank you. It worked well
Sulaymon Eshkabilov
Sulaymon Eshkabilov on 14 Aug 2021
Most welcome! So accepted the proposed solutions, right?!

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