random seed

I am using older version of GAUSS 6. How do I fixed the random sample for each replication in rndu generator? I use:

replication=1000;

rndseed=688671; then X=rndus(2,3,seed);

end of replication.

However, for each replication loop, X is different. I expect they should be exactly the same. Am I using the correct way of fixing the sample each time?

1 Answer



0



No, that is not correct. rndseed is used to set the internal seed which is used by random number generators which do not take a seed as an input. It is not set with an equals sign. Here is a simple example:

// Each iteration will print the same random numbers
for i(1, 2, 1);
    // No equals sign with 'rndseed'
    rndseed 777;
    print rndu(3, 1);
endfor;

If you are going to use a random number generator which accepts a seed as input, then you set this variable, not rndseed, like this:

// Each iteration will print the same random numbers
for i(1, 2, 1);
    seed = 777;
    print rndus(3, 1, seed);
endfor;

All of those will work for older or modern versions of GAUSS. This below will also work since about GAUSS 12:

// Each iteration will print the same random numbers
for i(1, 2, 1);
    seed = 777;
    { X, seed} = rndu(3, 1, seed);
    print X;
endfor;

aptech

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