Finds the argument numbered by i within the given expression.
The ith argument within the expression expr.
Empty() if that argument does not exist or is not specified.
Arg Expr() was deprecated in a previous release of JMP. Use Arg() instead.
Evaluates any expressions within expr, but leaves the outer expression unevaluated.
Find expr matching pattern.
Head Expr() is deprecated. Use Head() instead.
Head Name Expr() is deprecated. Use Head Name() instead.
N Arg Expr() is deprecated. Use N Arg() instead.
Returns the unevaluated expression of x rather than the evaluation of x.

Help created on 7/12/2018