yade-dev team mailing list archive

[boon chiaweng <booncw@xxxxxxxxxxx>]

Why does this not work in my Yade C file? It gives segmentation fault
   #include "Python.h"
   Py_Initialize();
   PyRun_SimpleString("x=1");
   PyRun_SimpleString("print x");
   Py_Finalize();

I am planning to do this is C:
    #include<yade/scripts/boon/aaa.py 
    PyRun_SimpleString("abc(input parameters)");
And in aaa.py:
     def abc(input parameters):
           some subroutine algorithm for abc

Please correct me.


Yours,

Boon
From: booncw@xxxxxxxxxxx
To: yade-dev@xxxxxxxxxxxxxxxxxxx
Date: Fri, 26 Mar 2010 08:05:08 +0800
Subject: Re: [Yade-dev] Another python software








Thanks, Vaclav for this pointing out.  In this case, I'd like to call PeriodicPythonRunner in my .cpp file.  But the function/command to give as input to PeriodicPython runner would have to be in python, e.g. 'AddPlotData'.   Could you tell me how to do that please?

PeriodicPythonRunner(virtPeriod=3e-5/strainRateTension,realLim=5,command='addPlotData()',label='plotDataCollector'),

Also, since I want to use my CvxOpt when 'required' and not governed by time, what do I give as input to virtPeriod?


Yours,

Boon


> From: eudoxos@xxxxxxxx
> To: yade-dev@xxxxxxxxxxxxxxxxxxx
> Date: Thu, 25 Mar 2010 22:52:59 +0100
> Subject: Re: [Yade-dev] Another python software
> 
> 
> > Although the FORTRAN code/software/library is my first choice, I am
> > also planning to try this python opensource code:
> > 
> > http://abel.ee.ucla.edu/cvxopt/examples/other/embed_cvxopt.html
> > 
> > There are examples how to link python to C.  But how do I do it for
> > YADE?
> 
> The simplest is to install python-cvxopt package and use it from your
> python scripts.
> 
> Calling python code from c++ is (in yade's context) discouraged, as you
> want to have only computationally demanding parts in c++, where calling
> python would harm performance (except for various hooks, which are
> called only rarely). There are still several options:
> 
> 1. use PeriodicPythonRunner engine to call any python function you
> define, which will do what you need in pure python.
> 
> 2. use pure python/c API (whic his shown in the example you referenced)
> or boost::python to run python code. Have a look at PeriodicPythonRunner
> how it does that for simple case, where you don't need to pass c++
> objects to the function called.
> 
> HTH, Vaclav
> 
> 
> 
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