sum of rand matrix equal to zero
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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..........
采纳的回答
Hooman Habibi
2015-5-5
0 个投票
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）
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
2015-5-5
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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