sum of rand matrix equal to zero

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Offroad Jeep
Offroad Jeep il 5 Mag 2015
Commentato: Offroad Jeep il 17 Mag 2016
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..........

Risposta accettata

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

Più risposte (2)

Bus141
Bus141 il 5 Mag 2015
Modificato: Bus141 il 5 Mag 2015
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 il 5 Mag 2015
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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