[ADOL-C] extra arguments

[Alfonso Callejo]

Hi again,

Here's another question.
Let our function be:

y = myfunction(double x, double aux){
   trace_on(0);
      adouble xa, auxa;
      auxa <<= aux;
      xa <<= x;
      auxa * xa >>= y;
   trace_off();
}

where "aux" is an extra parameter (and therefore we'll only want dy/dx).
As far as I know, dauxa/dx is assumed to be zero. Is there any way of
giving dauxa/dx an initial value (different from zero)? Ideally, it would
be something like:

auxa <<= aux;
auxa.derivative() = whatever

Thanks a lot.
Alfonso

El 6 de marzo de 2012 03:02, Andrea Walther
<awalther at math.uni-paderborn.de>escribió:

> Hi Alfonso,
>
>
>  The problem with the approach you suggest is that the evaluation of
>> jacobian() and the other drivers would return, in addition to the "true"
>> derivatives, the derivatives of the dependent variables with respect to
>> those "fake" independent variables, right?
>>
>
> yes that is true. However, usually this would not harm the computing time
> too much and one can just ignore the additional derivatives.
>
> Currently, this is the easiest way to take additional parameters into
> account.
>
> Best regards,
>
>
> Andrea
>
> --
> Prof. Dr. Andrea Walther
> Lehrstuhl fuer Mathematik und ihre Anwendungen
> Institut fuer Mathematik
> Universitaet Paderborn
> Warburger Str. 100
> 33098 Paderborn
>
> Email: andrea.walther at uni-paderborn.**de <andrea.walther at uni-paderborn.de>
> Phone: ++49 5251 602721
>       ++49 5251 602724 (sekr.)
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>
> **********
>
>
>
>
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