
                                %Functions%

        Functions are alphanumeric strings followed by no more than four
   arguments.  The argument are surrounded by parenthesis and seperated
   by commas.  Up to four optional subscripts may be specified before
   the arguments.  Subscripts are surrounded by square brackets and seperated
   by commas.  Functions should not be confused with %Standard Functions%.

   %Examples%

   þE1 : position(t,x,y,z)
   þE2 : J[0](12.3 + x)

   "position" is a function with 4 arguments "t,x,y,z".
   "J" is a function with one index, "0", and one argument, "12.3 + x".

