Hi, Le vendredi 22 février 2019 21:33:38 UTC+1, Richard_L a écrit :
> > I conclude there is something about the scalar field which is not being > defined until the .display() is executed. > Is this the intended behavior, or an oversight? > The issue is not related to scalar fields: it is unfortunately a bug in the Maxima / Sage interface, triggered by the fact that 'psi' is a special function in Maxima: http://maxima.sourceforge.net/docs/manual/maxima_15.html#Item_003a-psi This bug has been encountered before: https://ask.sagemath.org/question/43287/ In your case, a quick workaround is to name the symbolic function by something different from 'psi', e.g 'psi0': psi = E.scalar_field({c_E: function('psi0')(r,th,ph)}, name='psi',latex_name='\psi') Another solution is to use SymPy instead of Pynac/Maxima for the symbolic backend. It suffices to add the line E.set_calculus_method('sympy') just after E = EuclideanSpace(3) Then everything works well... Eric. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
