It depends on what you intend to do with the expression. If you're only interested in having it print correctly, you can write a custom function that defines LaTeX printing in the way you want (see https://docs.sympy.org/latest/guides/custom-functions.html#printing). For example
class F(Function): @classmethod def eval(cls, p, f): pass def _latex(self, printer): p, f = self.args _p, _f = printer._print(p), printer._print(f) return r'\left | %s \right | {L^{%s}}' % (_p, _f) And use it like p, f = symbols('p f') F(p, f) However, the issue here is that f isn't really a function, it's a symbol. In SymPy it's currently not possible to represent Function objects as symbolic objects (see https://github.com/sympy/sympy/issues/4787). So if you want to later use f as a SymPy function that you can call with other arguments, you'll have to structure it differently. Aaron Meurer On Thu, Sep 1, 2022 at 3:42 PM Yang Liu <micat...@gmail.com> wrote: > > I am trying to define a Sympy function $F(p,f)=|f|{L^p}$ symbolically. So it > take Symbol("p") and Function f and output is in latex form of $|f|{L^p}$. > Any idea of how to do it? > > Thanks a lot! > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/fb7bab86-69f5-49a2-9a49-73b1a03d033fn%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6LR2oo73EJQQLSXtm_b6zAuy_XPN6mg%2B%2BZhV8d9pdwtbw%40mail.gmail.com.