set the state for the random number generator

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jack
jack 2011-3-31
评论： Steven Lord 2018-5-21
For the function "randn", one can use
randn('state',100);
to set the state.
How about the generator "*poissrnd*"?

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the cyclist
the cyclist 2011-4-1
编辑：John Kelly 2015-3-2
If you are using an older version of MATLAB, then setting the state for rand (rather than randn) will set the state for poissrnd as well.
However, if you are using a relatively new version of MATLAB, the preferred method is to set the random number stream via RandStream:
stream = RandStream('mt19937ar','Seed',28);
RandStream.setDefaultStream(stream);
where you should put some integer where I put "28".
You can read more in the help file for RandStream, or lots more detail here: http://www.mathworks.com/help/matlab/ref/randstream.html.
I believe all the random number generators work off of the stream, but I am not 100% sure of that. I did verify that I got the same sequence of numbers from poissrnd after setting the seed like this.
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jack
jack 2011-4-1
stream = RandStream('mt19937ar','Seed',28);
RandStream.setDefaultStream(stream);
For the matlab I used(R2010b), this works well. Thanks.

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