Hi Ruediger,
> Basically all I need at the moment is a way to call root from within
> my (C++ / gcc 3.2) program when needed and let it execute a script,
> that in addition must have access to some data supplied by the program
> and be able to return the (floating point) result of running the script -
> i.e. a single double.
>
> double EVA::customValue(void) // evaluation function used in Evol. Algorithm;
> // this is compiled code
> {
> double result=
>
> commandToRunRoot("/where/script/resides/script.cc",stlVectorWithDoubles);
> return result;
> }
Translated to existing root methods it could look something like this:
double EVA::customValue(void) {
double result = gROOT->ProcessLineFast(
Form("/where/script/resides/script.cc(%p);",
&stlVectorWithDoubles));
return result;
}
Your script will have to look like this:
double script(std::vector<double>* pvec){
...
}
> I believe that this can be done in a much more elegant way with root, and
> would like to ask you for a pointer to some good examples or any other
> available information.
Have a look at
http://root.cern.ch/root/html/TROOT.html#TROOT:ProcessLine
and its neighbors ProcessLineSync and ProcessLineFast, depending on how
you want that script to be executed (in parallel or synchronously).
Watch out with the different ways in which these methods return the
script's result.
Cheers, Axel.
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