yade-dev team mailing list archive

[Chiara Modenese <c.modenese@xxxxxxxxx>]

The problem is that I have moved these alphas parameters (not yet in trunk)
to CohFricMat. I guess in such a case what you say would not apply, right?
Chiara



2010/12/6 Václav Šmilauer <eu@xxxxxxxx>

>
>  can I use the MatchMaker to get the harm average of alphas parameter? I am
>> not sure to understand how it works.
>> Cheers, Chiara
>>
> Hi, yes you can... You will turn (if we speak about
> Ip2_2xCohFrictMat_CohFrictPhys) alphaKr, alphaKts into MatchMaker objects,
> which will by default return constant value (so that older code behaves the
> same), something like (see also Ip2_FrictMat_FrictMat_FrictPhys):
>
> ((shared_ptr<MatchMaker>,alphaKr,new MatchMaker(2.0),,"docs"))
>
> where the "new MatchMaker(2.0)" will construct new object always returning
> 2.0 [note: I will be adding this ctor, since you gave me the idea, now, so
> you will need to update]. In the code then, you will get the value as
> (*alphaKr)(mat1->id,mat2->id,mat1->alphaKr,mat2->alphaKr) (alphaKr is a
> pointer, so once needs the *). To use harmonic average between mat1->alphaKr
> and mat2->alphaKr (of which value are ignored the MatchMaker returns a const
> value), you do in the python script
>
>
>  Ip2_2xCohFrictMat_CohFrictPhys(...,alphaKr=MatchMaker(fallback='harmAvg'),...)
>
> and that's it. One can still set the constant with
>
>  Ip2_2xCohFrictMat_CohFrictPhys(...,alphaKr=2.0)
>
> There is one margin case that you must handle in the c++ code, and that is
> if the shared_ptr<MatchMaker> is NULL pointer (is someone says in python
> alphaKr=None), then throw exception or something similar.
>
> Cheers, v.
>
>
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