Simply use
mr = function('m')(r)
See
https://nbviewer.jupyter.org/github/sagemanifolds/SageManifolds/blob/master/Worksheets/v1.3/SM_TOV.ipynb
for a full example.
Best wishes,
Eric.
Le dimanche 4 octobre 2020 à 10:15:43 UTC+2, matt...@gmail.com a écrit :
> I am trying to calculate the general expression of the Kretschmann scalar
> of metric depending a non specified function m(r): how do I define such a
> function? II have tried with
> def m(r)
> but it is wrong since it expects a definition of the function
>
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