When I try to define a function that takes no arguments, but does include an axis argument, the normal function editor complains:
*∇foo[x]* bad editor command '∇foo[x]' : problem 'Bad function header at Nabla.cc:495' DEFN ERROR ∇foo[x] ^ However, if I try to define the same function using ⎕FX, it gets defined: *⎕FX 'foo[x]' 'x'* 1 *)fns* EMACS_NATIVE bar foo But, it cannot be called: *foo[1]* 1 SYNTAX ERROR foo[1] ^ ^ Regards, Elias