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sum of rand matrix equal to zero

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Offroad Jeep
Offroad Jeep 2015-5-5
评论： Offroad Jeep 2016-5-17
Dear All,
I want to generate matrix A ,i.e. n by n random matrix but the sum(sum(A)) = zero. Help in this regard will be highly appreciated........
Regards..........

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采纳的回答

Hooman Habibi
Hooman Habibi 2015-5-5
Subtract the mean from the samples:
n=10; z=randn(n,n); z=z-sum(sum(z))/(n*n); sum(sum(z))

更多回答（2 个）

Bus141
Bus141 2015-5-5
编辑：Bus141 2015-5-5
The command randn pulls from a normal distribution with distribution N(0,1), implying with a large enough sample the mean should be zero. The sum of all dimensions should also converge toward zero since the values above and below the mean will cancel each other out, as they have equal probability.
Michael Haderlein
What kind of random distribution do you want? Here I use normal distribution, for other distributions just replace randn by the respective function:
n=100;
A=randn(100);
B=A-mean(A(:));
sum(B(:))
ans =
3.8913e-13
That's not exactly zero, but you'll not easily come close due to numerical precision.

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