yade-users team mailing list archive

[Benoit Charlas <benoit.charlas@xxxxxxxxxxx>]

Hi Chiara

I don't really understand your question. What I don't understand the 
most is do you want to apply this force once (for tot iteration) or 
every x TimeStep.
But i'll try to answer with my very little knowledge!

The function PeriodicPythonRunner allows you to apply an action (for 
example a Python function) periodically every : virtPeriod, realPeriod 
or iterPeriod
For example let's write that you want to apply your force every 1000 
iteration steps
forceengine=ForceEngine(/.../)
PeriodicPythonRunner(iterPeriod=1000,command='forceengine()')

But then you'll apply the same force every 1000 steps.

You can also apply an evolution to your force or anything you want while 
defining another function

Let's call your function "applyAForce()" and let's suppose you want to 
increment 10 times your force

O.engines=[
   ...
   PeriodicPythonRunner(iterPeriod=1000,command='applyAForce()')
]
...
def applyAForce():
   /your function with (nearly) everything you want like ForceEngine(...)/

You should check in the directory yade/examples. There are some useful 
tips in those examples !

Cheers,
Benoit


Václav Šmilauer a écrit :
> > is it possible to call an engine inside another engine in python? For
> > instance, can I use PeriodicPythonRunner to define a function that
> >     
> having
>   
> > satisfied a certain condition (say after tot iterations) call an engine
> > (say
> > apply a force)?
> >     
> Hi Chiara, engines are callable objects (define the __call__ method), so
> you can call them with (): 
>
> forceEngine=ForceEngine(...)
> forceEngine()
> # ForceEngine(...)() would also work
>
> You can make the forceEngine a variable so that the engine is not
> constructed every time.
>
> Cheers, Vaclav
>
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