Creating a matrix with rows and collumns

Hey guys. I have a matrix with 500 rows and 60 collumns of only numerical data. I have a script does calculates all possible summations between two rows (for example: row 1 + row 2, row 1 + row 3, row 1 + row 4 etc. When the script runs, Matlab calculates all summations, but instead of adding each calculation to a row, it overwrites the rows and in the end gives me only one row with data (as the rows are suppose to be 500x 500.

Thank anyone that can help me.

Tsvetelina

[EmirBeg]

Could you show us your code so we can tell you what to change?

[Tsvetelina Tomova]

Hey, yes. here it is:

[per isakson]

Your code overwrites test in every iteration.

Prepare a MWE:

• <4x4> rather <500x500>
• small whole numbers only (easier to debug)
• a sample subplots matrix
• expected result; matrix test

Make the MWE easy to download and use

[Torsten]

test(i,j,:) = subplot(i,:) + subplot(j,:) ;

Since test(i,j,:) = test(j,i,:), you can save some time if your inner loop only goes from j = i:500.

[KSSV]

You have to initilaize test first before the loop and then include indices in test while calculating the sum.

Answer 1

[Kartikay Sapra]

subplots = [1 2; 3 4; 5 6]

[rows cols] = size(subplots);
test = zeros([rows*(rows+1)/2 cols]);

k = 1;

for i = 1:rows
    for j = 1:cols
        test(k,:) = subplots(i,:) + subplots(j,:);
        k = k+1
    end
end

test

Try this code, for your code, rows = 500 and cols = 500. Store your calculations at a new index every time.