[aspect-devel] The problem of setting up initial composition

[Wolfgang Bangerth]

Nan,
the real problem is that you have two compositional fields, but you only 
provided one initial condition. You need to provide two expressions in this 
line, separated by a semi-colon.

The error message is of course completely unhelpful. I'm writing a patch to 
make this clearer.

Best
  Wolfgang


On 01/24/2016 11:23 PM, Nan Zhang wrote:
> Hi Wolfgang,
>
> Thanks for your fast reply. While, when I changed to sqrt, I still got error like:
> *************************************************************************
> ERROR: FunctionParser failed to parse
>          'Compositional initial conditions.Function'
> with expression
>          'if(sqrt(x*x+y*y+z*z)<3731000, 1, 0)'ERROR: FunctionParser failed to
> parse
> ERROR: FunctionParser failed to parse
> ERROR: FunctionParser failed to parse
> ERROR: FunctionParser failed to parse
> ERROR: FunctionParser failed to parse
>          'Compositional initial conditions.Function'
>          'Compositional initial conditions.Function'
>          'Compositional initial conditions.Function'
>          'Compositional initial conditions.Function'
> ...
> *************************************************************************
>
> I attached my input file below.
>
> Nan
>
> On Mon, Jan 25, 2016 at 11:38 AM, Wolfgang Bangerth <bangerth at tamu.edu
> <mailto:bangerth at tamu.edu>> wrote:
>
>     On 01/24/2016 09:19 PM, Nan Zhang wrote:
>
>
>               set Function expression = if(std::sqrt(x*x+y*y+z*z)<3731000, 1, 0)
>
>
>     You need to use std::sqrt in C++ code, but for the function parser, it is
>     simply 'sqrt'.
>
>     Best
>       W.
>
>     --
>     ------------------------------------------------------------------------
>     Wolfgang Bangerth               email: bangerth at math.tamu.edu
>     <mailto:bangerth at math.tamu.edu>
>                                      www: http://www.math.tamu.edu/~bangerth/
>
>


-- 
------------------------------------------------------------------------
Wolfgang Bangerth               email:            bangerth at math.tamu.edu
                                 www: http://www.math.tamu.edu/~bangerth/