How to correctly access a specific Weierstrass p-function in PARI? I want to write a script for PARI containing the Weierstrass p-function. I know that the right command is "ellwp(lattice,value,flag)". But if I need to work with the p-function for the same lattice multiple times and I set up a variable for it (p = ellwp([1,I]), how can I evaluate it afterwards? Intuitively I try "p(0.2 * I)", but I always get the error message "*** not a function in function call". I guess I could avoid this issue if I only set up a variable for the lattice and always call the ellwp function, but I would prefer not to do that.

You can define a function $\;\texttt{p = z->ellwp[1, I], z)}\;$ with a given lattice $\;\texttt{[1, I]}\;$and then, for example, you do $\;\texttt{p(0.2*I)}\;$ any time later using the given lattice.