Re: [Help-glpk] Test a model with random data on GLPK

[Heinrich Schuchardt]

Dear Shaghayegh,

glpsol cannot iterate over multiple models or data sets by itself.

https://en.wikibooks.org/wiki/GLPK/Scripting_plus_MathProg
shows how to use a scripting language to call glpsol multiple times.

You can pass the seed value for the random number generator like this

glpsol --seed SEEDVALUE

In Visual Basic Script you can create random numbers with the Rnd(1)
function, cf
https://msdn.microsoft.com/en-us/library/f7s023d2%28v=vs.90%29.aspx

In awk you can use function rand() to create random numbers.

Best regards

Heinrich Schuchardt


On 22.07.2015 01:12, Shaghayegh Mokarami wrote:
>  Hi
> 
> Im new on GLPK, I want to test my simple model, I use this comment to
> generate different random data:
> 
> param seed:=gmtime();
> param u{(i,j) in E}:=(round(seed*Uniform01())) mod 40 ;
> 
> and I want to solve model for 100 times and obtain the average value of
> optimal value of objective function.
> 
> I don't know how to code iterated expression to repeat solving model in .mod
> file. Could you please help me?
> 
> This is my model:
> 
> ###  VARIABLES  ###
> var x{(i,j) in E} >= 0, <= u[i,j];
> ###  OBJECTIVE  ###
> maximize Val: sum {(1,j) in E} x[1,j];
> ###  CONSTRAINTS  ###
> subject to Balance {i in V diff {1,n}}:
>   sum {(j,i) in E} x[j,i] = sum {(i,k) in E} x[i,k];
> solve;
> 
> 
> 
> 
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