How do I find averages of certain values in a matrix.
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Lakyn
on 22 Aug 2016
Commented: Walter Roberson
on 23 Aug 2016
Hi all!
So basically I have a 76x76 matrix, but I want to find the average for the values for the corresponding pairs, e.g. 1x2 and 2x1, 22x37 and 37x22, 6x58 and 58x6 etc, from 1x2 and 2x1 all the way to 75x76 and 76x75 (excluding repeated numbers like 1x1). Is there a way for me to do this and put it into like a table?
Thank you!
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Accepted Answer
Walter Roberson
on 22 Aug 2016
What does 22x37 denote here? Is that YourMatrix(22,37) Or is it all sub-matrices that are 22 rows and 37 columns?
Guessing on what you want:
triu( (YourMatrix + YourMatrix.') / 2, 1)
6 Comments
Walter Roberson
on 23 Aug 2016
temp = (YourMatrix + YourMatrix.') / 2;
mask = triu( true(size(temp)), 1 );
output_vector = temp(mask);
The last of them produces a cell array output; see http://www.mathworks.com/help/matlab/cell-arrays.html
output_cell{1} is the first diagonal as a vector, output_cell{2} is the second diagonal as a vector, and so on. The diagonals are the pairs whose indices add up to the same value -- so for example T(2,75), T(3,74), T(4,73), T(5,72) and so on. You have not really said what you want the table to look like.
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