[galib] Antwort: GAlib: how to initialize my first generation's individuals in real numbers (not zeros) ?

Kupfer, Michael (ARC-AFA)[UC SANTA CRUZ] Michael.Kupfer at nasa.gov
Wed Oct 1 12:38:03 EDT 2008

Hello Torsten, Hello Yi!


I am myself a GAlib beginner but what I'd suggest is to write your own initializer.

I believe there even should be some examples.

But here is a code snippet from my application.

What you have to do is basically replace what I did in the MyArrayInitializer with your desired real numbers.

Maybe this helps.






Michael Kupfer



University Affiliated Research Center

UC Santa Cruz

NASA Ames Research Center

Building 210, Room 255, Mail Stop 210-6

Moffett Field, CA 94035



Email: Michael.Kupfer -AT- nasa.gov <mailto:Michael.Kupfer at nasa.gov> 

Phone: (650)604-6424












//------------------- own initializer ----------------------

void MyArrayInitializer(GAGenome & g)


      int sep_value;


      GARealGenome &genome = (GARealGenome &)g;


      // set first gene to the ETA_f

      genome.gene(0, unit[0].arr_f);


      //[SNIP ... ]

//check for some constraint violation


// set the other genes ...

      if(unit[i].arr_f > genome.gene(i-1) + SV)


            genome.gene(i, unit[i].arr_f);




            genome.gene(i, genome.gene(i-1) + SV);



//---------------------end of own initializer--------------------------


//--------------begin of main------------------------------------------


int main(int argc, char* argv [])


      // declaration of the GAlib included random number generator      

      void GARandomSeed(unsigned s = 0);


      //[SNIP ... ]


      GARealGenome genome(alleles, Objective); 





      //[SNIP ... ]






From: galib-bounces at mit.edu [mailto:galib-bounces at mit.edu] On Behalf Of Torsten.Gutjahr at ise.fraunhofer.de
Sent: Tuesday, September 30, 2008 10:32 AM
To: yi.zong at risoe.dk
Cc: galib-bounces at mit.edu; galib at mit.edu
Subject: [galib] Antwort: GAlib: how to initialize my first generation's individuals in real numbers (not zeros) ?


Dear all, 

I have the same problem like Yi Zong. Please, could somebody help us? 

Best Regards 


Torsten Gutjahr 
Dept. Materials Research and Applied Optics
Fraunhofer-Institut für Solare Energiesysteme ISE
Heidenhofstraße 2, 79110 Freiburg, Germany
Phone: +49 (0) 7 61/ 4588-59 80  Fax: +49 (0) 7 61/ 4588-99 81
torsten.gutjahr at ise.fraunhofer.de

yi.zong at risoe.dk 
Gesendet von: galib-bounces at mit.edu 

30.09.2008 16:30 


galib at mit.edu 




[galib] GAlib: how to initialize my first generation's individuals in real numbers (not zeros) ?




Dear all, 
  When I use Galib to optimize, I want to initialize my first generation's individuals in some real numbers (not zeros), which I think they are in the best results range. That is to say, the first generation is specified as some numbers by myself and not gets diverse by random seed. 
  How can I realize it? 
  Thank you in advance, 

Yi Zong
Post doc
Phone direct +45 4677 5045
yi.zong at risoe.dk

Wind Energy Department
Risø National Laboratory for Sustainable Energy
Technical University of Denmark - DTU
Building 118, P.O. Box 49
DK-4000 Roskilde, Denmark
Tel +45 4677 4677
Fax +45 4677 5083

galib mailing list
galib at mit.edu

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