sum of rand matrix equal to zero

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Offroad Jeep
Offroad Jeep 2015년 5월 5일
댓글: Offroad Jeep 2016년 5월 17일
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..........

채택된 답변

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

추가 답변(2개)

Bus141
Bus141 2015년 5월 5일
편집: Bus141 2015년 5월 5일
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
Michael Haderlein 2015년 5월 5일
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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