Obtaining same values at avery simulation using rand function

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Salvatore Mazzarino
I'm building some simulations with matlab and I use rand function. I would obtain at every run, the same results. I read somewhere I have to set the seed of rand function. I tried using
s = RandStream('mcg16807', 'seed', 0)
RandStream.setGlobalStream(s);
but it didn't work.Maybe I made some mistake.

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采纳的回答

Wayne King
Wayne King 2012-9-14
I think you should use the newer rng
rng default;
x = randn(100,1);
rng default
y = randn(100,1);
max(abs(x-y))
x and y are the same sequence.
In general, you can capture the random generator settings and resuse them
S = rng;
x = randn(100,1);
rng(S)
y = randn(100,1);

更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-9-14
y=rand(1,100);
save file y
%when you need y
load file
Oleg Komarov
Oleg Komarov 2012-9-14
编辑：Oleg Komarov 2012-9-14
You can use rng()
rng(1)
rand(1,5)
rng(1)
rand(1,5)
Or with your approach:
s = RandStream('mcg16807', 'seed', 0);
RandStream.setGlobalStream(s);
rand(1,5)
s = RandStream('mcg16807', 'seed', 0);
RandStream.setGlobalStream(s);
rand(1,5)

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