Listable
 Usage
• Listable is an attribute that can be assigned to a symbol f to indicate that the function f should automatically be threaded over lists that appear as its arguments.
Notes
• Listable functions are effectively applied separately to each element in a list, or to corresponding elements in each list if there is more than one list. • Most built-in mathematical functions are Listable. • Example: Log is Listable. Log[ a,b,c ]  . • All the arguments which are lists in a Listable function must be of the same length. • Arguments that are not lists are copied as many times as there are elements in the lists. • Example: Plus is Listable.  a, b, c + x . • New in Version 1.
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