marshalling GPPopulation

[Simone Bronzin]

Hi all,

Is there any easy way to marshal and unmarshal a GPPopulation?

thank you,

Simone Bronzin
Unitary
Executive

mobile: [phone]



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[Klaus Meffert-5]

Simone,

You could use Xstream, which is includes with JGAP. E.g.:

//To read an object from file
      XStream xstream = new XStream();
      File f = new File(a_filename);
      InputStream oi = new FileInputStream(f);
      GPGenotype result = (GPGenotype) xstream.fromXML(oi);

// To write, use xstream.toXML

Or use xstream.marshal(..) and xstream.unmarshal --> also see
Internet-documentation

Best

Klaus
www.klaus-meffert.com

 

> -----Original Message-----
> From: Simone Bronzin [mailto:simone.bronzin@...]
> Sent: Friday, September 11, 2009 11:30 AM
> To: jgap-users@...
> Subject: [jgap-users] marshalling GPPopulation
>
> Hi all,
>
> Is there any easy way to marshal and unmarshal a GPPopulation?
>
> thank you,
>
> Simone Bronzin
> Unitary
> Executive
>
> mobile: [phone]
>
>
>
> --------------------------------------------------------------
> ----------------
> Let Crystal Reports handle the reporting - Free Crystal
> Reports 2008 30-Day trial. Simplify your report design,
> integration and deployment - and focus on what you do best,
> core application coding. Discover what's new with Crystal
> Reports now.  http://p.sf.net/sfu/bobj-july 
> _______________________________________________
> jgap-users mailing list
> jgap-users@...
> https://lists.sourceforge.net/lists/listinfo/jgap-users

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[Klaus Meffert-5]

Simone,

the main cause is that either result is null or the GP configuration of
result. Please ensure that result is not null when writing to a file.
I would also suggest to not append to the file in this case.

Normally, you should not marhal the GP configuration as it could become
quite lengthy as XML, maybe a circular reference could occur. Better would
be rebuilding the GP config. After unmarshalling a GPProgram and setting the
config. to it.

Best

Klaus
www.klaus-meffert.com

 

> -----Original Message-----
> From: Simone Bronzin [mailto:simone.bronzin@...]
> Sent: Tuesday, September 15, 2009 11:55 AM
> To: Klaus Meffert
> Cc: jgap-users@...
> Subject: RE: [jgap-users] marshalling GPPopulation
>
> Klaus,
>
> thank you for your reply. I got an error. Running this
>
> ...
>          XStream xstream = new XStream();
>
>         PrintWriter outFile = new PrintWriter(new
> FileOutputStream("gpprogram.xml", true));
>
>         String xml = xstream.toXML(gp.getAllTimeBest());
>
>         outFile.print(xml);
>         outFile.close();
>
> File f = new File("gpprogram.xml");
>         InputStream oi = new FileInputStream(f);
>         GPProgram result = (GPProgram) xstream.fromXML(oi);
>
>         double gpFitness = fitness.evaluate(gp);
>
> a NullPointerException is raised at the line
>
> protected double evaluate(final IGPProgram gpProgram) { ...
> gpProgram.getGPConfiguration().clearMemory(); // HERE ...
> }
>
>
> it seems that GPConfiguration.m_memory is not correctly set
> by the unmarshaling process, and remains null. Before diving
> into xstream documentation I was wondering if I missed something.
>
> Thank you,
>
> Simone
>
>
> Def. Quota Klaus Meffert <jgap@...>:
>
> > Simone,
> >
> > You could use Xstream, which is includes with JGAP. E.g.:
> >
> > //To read an object from file
> >       XStream xstream = new XStream();
> >       File f = new File(a_filename);
> >       InputStream oi = new FileInputStream(f);
> >       GPGenotype result = (GPGenotype) xstream.fromXML(oi);
> >
> > // To write, use xstream.toXML
> >
> > Or use xstream.marshal(..) and xstream.unmarshal --> also see
> > Internet-documentation
> >
> > Best
> >
> > Klaus
> > www.klaus-meffert.com
> >
> >
> >
> >> -----Original Message-----
> >> From: Simone Bronzin [mailto:simone.bronzin@...]
> >> Sent: Friday, September 11, 2009 11:30 AM
> >> To: jgap-users@...
> >> Subject: [jgap-users] marshalling GPPopulation
> >>
> >> Hi all,
> >>
> >> Is there any easy way to marshal and unmarshal a GPPopulation?
> >>
> >> thank you,
> >>
> >> Simone Bronzin
> >> Unitary
> >> Executive
> >>
> >> mobile: [phone]
> >>
> >>
> >>
> >> --------------------------------------------------------------
> >> ----------------
> >> Let Crystal Reports handle the reporting - Free Crystal
> Reports 2008
> >> 30-Day trial. Simplify your report design, integration and
> deployment
> >> - and focus on what you do best, core application coding. Discover
> >> what's new with Crystal Reports now.  
> http://p.sf.net/sfu/bobj-july 
> >> _______________________________________________
> >> jgap-users mailing list
> >> jgap-users@...
> >> https://lists.sourceforge.net/lists/listinfo/jgap-users
> >
> >
>
>
>
> Simone Bronzin
> Unitary
> Executive
>
> mobile: [phone]
> phone: +39.
>

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