Rose - What code are you referring to?
- Jon On Jan 27, 2014, at 4:34 PM, yuan wang <rose.w...@tufts.edu> wrote: > Dear Jonathan, > > I've already solved the previous problem. But now I have some new problems. > My research is about solving a series (about 10) of coupled nonlinear partial > differential equations. They are coupled in the reaction term (implicit > source and source term). The reaction is second order reaction, which causes > the non-linearity. Because of that, I need to solve them iteratively. I use > sweep to do that but could not get convergence out of it. I'm not sure > whether it's because of the mechanism set up is not correct, or because I > didn't use fipy correctly. Would you mind taking a look at my code? Based on > your experience, would that many pdes have good convergence? > Thank you. > > Best regards, > Rose > > > On Mon, Jan 27, 2014 at 2:50 PM, Guyer, Jonathan E. Dr. > <jonathan.gu...@nist.gov> wrote: > Thanks for the information. I suspect that the problem is not that b*c is an > operator variable (it is), but rather that a is an operator variable and you > are attempting to set its value, which is not permitted. The value of an > operator variable is determined by the operation and the values of the > variables that compose the operation. > > What is it that you would like to do? Establish a functional relationship? > Set an initial condition? Is `a` a variable you are solving for or a > coefficient that you are setting? > > On Jan 27, 2014, at 1:10 PM, yuan wang <rose.w...@tufts.edu> wrote: > > > Jonathan, > > > > I think I got the error because I was trying to do a.value = b*c, where b > > and c are CellVariables. b * c become an operator variable, which cannot be > > assigned to the LHS (numpy arrary). > > a = b*c should work if all of them are CellVariables. > > > > Sorry for the confusion and thank you for your help. > > > > Best regards, > > Rose > > > > > > On Mon, Jan 27, 2014 at 10:39 AM, Guyer, Jonathan E. Dr. > > <jonathan.gu...@nist.gov> wrote: > > > > On Jan 24, 2014, at 5:11 PM, yuan wang <rose.w...@tufts.edu> wrote: > > > > > All the operations made on CellVariables will be stored as > > > binaryOperatorVariables. The operation is not actually conducted, until > > > the result is requested by numpy.array() or .value operation. It's like > > > the operations are just doing book keeping of the account, but the > > > numpy.array() method encash the final values. Even though, the operators > > > will work the same on CellVariables as on numpy arrays. > > > > As Daniel said, this is an accurate understanding. > > > > > > > I wrote something like a = b*c, but it does not work. An error pop up > > > saying, "TypeError: The value of an `_OperatorVariable` cannot be > > > assigned" > > > > Can you tell us exactly what you did to generate this error? It is not > > possible to have gotten this error from writing "a = b*c", no matter what > > a, b, or c are. Python syntax just doesn't work that way. > > > > I believe you got the error, and if you tell us exactly what code you wrote > > and what you are trying to accomplish, it will help us direct you to the > > right expression. > > > > > > _______________________________________________ > > fipy mailing list > > fipy@nist.gov > > http://www.ctcms.nist.gov/fipy > > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > > > > > > > -- > > Yuan (Rose) Wang > > PhD Candidate, Tufts University > > Cellphone: 617-699-8006 > > _______________________________________________ > > fipy mailing list > > fipy@nist.gov > > http://www.ctcms.nist.gov/fipy > > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > > _______________________________________________ > fipy mailing list > fipy@nist.gov > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] > > > > -- > Yuan (Rose) Wang > PhD Candidate, Tufts University > Cellphone: 617-699-8006 > _______________________________________________ > fipy mailing list > fipy@nist.gov > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] _______________________________________________ fipy mailing list fipy@nist.gov http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
