Question #189288 on Yade changed: https://answers.launchpad.net/yade/+question/189288
Jan Stránský posted a new comment: Hello, > Really, I want to build an array like this > tt=[] > tt=[ForceEngine(ids=[i],force=(0,0,i),label="ttForce") for i in ids_sp] > and tt[0],tt[i] are the ForceEngine, > but I donnot know how to add it to the O.engine if ids_sp is a big number. > a loop method like "for i in ids_sp " cannot be insert to O.engine like > this: > you can achieve this by: tt=[ForceEngine(ids=[i],force=(0,0,i),label="ttForce"+str(i)) for i in ids_sp] O.engines = [ ... ] + tt + [ ... ] where [ ... ] stands for standard code you would write before / after your ForceEngines > > # a message SyntaxError: invalid syntax is given because of using for > loop > it is not because of using for loop, it is because of using it incorectly. > > PyRunner, which executes O.forces.addF for each particle in each > iteration may be a method, but it is not the most efficient one, maybe > the force keep as a constant for a time, and then anoter constant for a > next time. > I am not sure what would be faster (you can test it :-), but I would say that anyway it should not be significant in comparison to other engines (at least with applying force to only some particles) cheers Jan -- You received this question notification because you are a member of yade-users, which is an answer contact for Yade. _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
