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[chiara modenese <c.modenese@xxxxxxxxx>]

It seems not working...
Basically I want to apply a constant force after a certain number of
iterations. So I do:

In the list of engines:
PeriodicPythonRunner(iterPeriod=1,command='shearForce()')

I define the function as:
def shearForce():
    if (O.iter>300):
        i=O.interactions[0,1]
        ForceEngine(force=(0,1e5,0),subscribedBodies=[0])
        plot.addData(fs=i.phys.shearForce[1],it=O.iter)

But it does not apply such force (I have checked through the plot). Any
suggestions? Is it right to go on in this way?

Thanks, Chiara



On 19 March 2010 14:35, Benoit Charlas <benoit.charlas@xxxxxxxxxxx> wrote:

>  Hi
>
> Did you manage to understand?
>
> Benoit
>
> chiara modenese a écrit :
>
> Hi! Thanks for your answer. I have tried to include the ForceEngine as
> ForceEngine(force=(100000000,0,0))
> in the list of the engines (so at the moment it is just a simple case, not
> using PyRunner) but I do not see any force applied to my bodies... If I use
> ForceEngine should I also specify the id of the body/ies I want to apply the
> force on?
> I am still learning..;)
>
> Cheers, Chiara
>
> 2010/3/19 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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