sum of all matrix elements equal to zero

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Offroad Jeep 2016-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/284088-sum-of-all-matrix-elements-equal-to-zero

回答： John D'Errico 2016-5-13

采纳的回答： John D'Errico

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Hi, kindly check the code. I want a matrix whose total sum of elements is zero.......

regards

clc
clear all
format compact
nrows = 5
afm_array = ones(nrows)
theta = round((rand(5)-0.5) * 360)
theta(5,5) = 0
alpha = sum(sum(theta))-360
theta(5,5) =  - alpha
theta_new = theta
add_theta = sum(sum(theta_new))

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Answer 1

John D'Errico 2016-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/284088-sum-of-all-matrix-elements-equal-to-zero#answer_222023

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Well, you COULD just subtract off the sum of the matrix, divided by the number of elements in the matrix.

theta = theta - sum(theta(:))/numel(theta);

That is actually not a terribly good way to solve the problem, for reasons I don't feel like going into here, because it will take a lot of explanation. Just accept it works, but is not the best solution.

Better would be to use a tool like randfixedsum, from the file exchange.