Creating a matrix with rows and collumns

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Tsvetelina Tomova
Tsvetelina Tomova 2021-5-21
回答： Kartikay Sapra 2021-5-21
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
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Torsten
Torsten 2021-5-21
编辑：Torsten 2021-5-21
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
KSSV 2021-5-21
You have to initilaize test first before the loop and then include indices in test while calculating the sum.

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Kartikay Sapra
Kartikay Sapra 2021-5-21
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.

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