Dear Mr. Webb,
thank you very much for your quick and accurate answer.
>You seem to be confused between atom selections and restraints.
Actually, I was thinking of fixing the position of atoms in space. To me, this means adding constraints. Since I learned, that Modeller features no constraints, my next idea was to add a upper-bond harmonic potential, i.e. restraints to the r(1),r(2),r(3)-components in space. Studying this mailinglist, I found out that in Modeller, deselection would be the appropiate way.
> I don't know where you got that link from;
My apologize, I thought this was an official mirror, sorry for that.
> I can't give you an example that does "exactly what has been requested" because you didn't give the exact problem.
Anyway, your example tackled "exactly what has been requested" ;-) I was just confused by the first redefinition of the member actually *initializing* the selection_status parameter. However, I got it, now: The status is initializes *before* selecting the residues selected in selection_segment ;-) *That* was my confusion...
Sincerly yours