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From: Yujie <recrusader@gm...>  20100224 02:19:16

Thanks, Roy. According to your advice. Maybe, it should be better to clear the solution vector after finishing the rhs. Regards, Yujie On Tue, Feb 23, 2010 at 7:48 PM, Roy Stogner <roystgnr@...>wrote: > > On Tue, 23 Feb 2010, Yujie wrote: > > Without mesh refinement, how to solve the linear equation with multiple >> rhses. In current libmesh framework, >> >> one can use "equation_systems.get_system("system").solve()" to get the >> solution with one rhs. >> >> In .solve(), there are assemble() and solver() functions. rhs can be >> replaced in assemble(). However, which parameters need to be reinitialized >> after finishing one rhs? Whether it is ok to call >> equation_systems.reinit() >> to reinitialize necessary parameters for multiple rhses? Thanks a lot. >> > > Depends on how complicated your system is, but in general you > shouldn't need to reset anything except (perhaps) the solution (which > gets used as a starting guess in iterative solvers) before solving > with a new right hand side. Take a look at the parameter sensitivity > methods in implicit_system.C for some examples; since we use multiple > solution and rhs vectors there we don't have to reinitialize anything > at all. >  > Roy > 