Question #128351 on DOLFIN changed: https://answers.launchpad.net/dolfin/+question/128351
Johan Hake proposed the following answer: On Friday October 8 2010 00:12:26 Anders Logg wrote: > Question #128351 on DOLFIN changed: > https://answers.launchpad.net/dolfin/+question/128351 > > Status: Open => Answered > > Anders Logg proposed the following answer: > > On Thu, Oct 07, 2010 at 08:01:27PM -0000, Sungick Kim wrote: > > New question #128351 on DOLFIN: > > https://answers.launchpad.net/dolfin/+question/128351 > > > > Let 'u' be a scalar nodal value. > > Now I want to construct a nodal vector field as below. > > > > velocity = Expression(('u', '0.0', '0.0')) > > > > There comes no error related this. > > However, it seems that velocity = (0,0,0) all throughout domain. > > Can anyone help me to know the right way to do this? > > Have you set the value of u? I am not exactly sure what you want to do, but if you just have a scalar value, you need to initilize u in your Expression. This can be done in two ways: velocity = Expression(('u', '0.0', '0.0'), {'u':value}) or velocity = Expression(('u', '0.0', '0.0')) velocity.u = value There are no errors because u is initialized to Zero. Take a look in the docstring of Expression. Johan -- You received this question notification because you are a member of DOLFIN Team, which is an answer contact for DOLFIN. _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
