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[Help-glpk] Seed for random functions

From: xypron
Subject: [Help-glpk] Seed for random functions
Date: Tue, 23 Dec 2008 12:58:09 -0800 (PST)

Hello Andrew,

currently there is not way to set the seed of the random number generator in

I suggest to implement the same syntax as in AMPL:

option randseed n;

n is a numeric expression.Only the integer part of the number is used.

Hence it would be possible to write:
option randseed gmtime();
to create a new random seed on any invocation of the model.

"option randseed" only has to call 
rng_init_rand(mpl->rand, int seed)

Concerning implementing the option statement I am thinking of the following
full syntax:
option {domain} first_parameter second_parameter;

This will allow for future further options being set automatically based on
a table statement:
set O, dimen 2;
table t IN "CSV" "option.csv" : O<-[option, value];
option {(o,v) in O} o v;

The new syntax could be used in a future implementation of glpsol to set
elements of structures glp_smcp and glp_iocp controlling the solver.

Best regards

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