Dear all, Since nobody else reacted (maybe I missed some mails), I would like to refer to Dana's mail to address NOT the scientific part of her question but the linguistic one. (since there was no suite of Dana's request in phenixbb, I suppose that people understood her question and answered her in private; good luck to Dana). It makes me unhappy (saying politely) when, frequently enough, I see/hear the expression "structure minimization" even when it became a part of jargon. Nobody can MINIMIZE a STRUCTURE ! One can minimize energy or some other FUNCTION of a model, one can OPTIMIZE a structural model (in the sense that the model fits better some data), but please not "minimize a structure". Such an expression is not really innocent, especially for young researchers, because when talking about minimization (rather optimization) problems, one should have clear in his mind : - what is the model, which parameters can be modified (like Dana said, rigid body) - what is the score function, what will be minimized or maximized (definitely NOT a structure :)) - by which minimization method will we achieve this. and "structure minimization" makes a confusing of all this. I would wish that we (I mean our community as a whole) "minimize" :) using wrong expressions like that. Sorry for my intervention. With best wishes, Sacha Urzhumtsev -----Message d'origine----- De : [email protected]mailto:[email protected] [mailto:[email protected]] De la part de [email protected]mailto:[email protected] Envoyé : mardi 15 janvier 2013 08:34 À : [email protected]mailto:[email protected] Objet : [phenixbb] Structure minimization for model with rigid body ... We're interesting in performing a structure minimization for a model, while treating a part of the model as a rigid body. ... Dana.