How do you add every row of a matrix to every other row to get separate new matix for each addition ?

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Avishka Karunaratne
评论： Hongyuan Wang 2018-11-23
I have a 10 by 10 matrix And if I were to consider each row as S1, S2 ..... S10 how would I be able to code in such a manner that I will be able to get S1+S1, S1+S2, ...S10+S10 ( as in every possible pair) to generate new matrices for each addition.

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Matthew Eicholtz
Matthew Eicholtz 2016-2-12
I know this only partially answers your question, but it may help you get started.
To add a row to every row of a matrix, use bsxfun.
x = magic(10); %sample 10x10 matrix
y = bsxfun(@plus,x,x(1,:)); %adds the first row of x to every row of x

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Guillaume
Guillaume 2016-2-12
The cartesian product of two sets of number can be obtained easily with matlab with ndgrid. Possibly the easiest way to obtain what you want is to get the cartesian product of the row indices and pass that to arrayfun:
m = toeplitz(1:10, 1:2:19) %demo matrix
[ridx1, ridx2] = ndgrid(1:size(m, 1));
allsums = arrayfun(@(r1, r2) m(r1, :) + m(r2, :), ridx1, ridx2, 'UniformOutput', false)
Element (i,j) of the cell array corresponds to the sum of row i with row j. You can convert the cell array output to a 2D matrix, if you want:
vertcat(allsums{:})

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