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 <[email protected]> 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. > <[email protected]> wrote: > > On Jan 24, 2014, at 5:11 PM, yuan wang <[email protected]> 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 > [email protected] > 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 > [email protected] > http://www.ctcms.nist.gov/fipy > [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ] _______________________________________________ fipy mailing list [email protected] http://www.ctcms.nist.gov/fipy [ NIST internal ONLY: https://email.nist.gov/mailman/listinfo/fipy ]
