This is documentation for Mathematica 3, which was
based on an earlier version of the Wolfram Language.
 Count Count[ list , pattern ] gives the number of elements in list that match pattern. Count[ expr , pattern , levelspec ] gives the total number of subexpressions matching pattern that appear at the levels in expr specified by levelspec. Level specifications are described in Section A.3.6. See the Mathematica book: Section 1.8.5, Section 2.3.2. See also: FreeQ, MemberQ, Cases, Select, Position. Related package: Statistics`DataManipulation`. Further Examples (See the Further Examples for FullSimplify for a demonstration of how Count can be used to affect the outcome of a simplification.) This counts the number of occurrences of Real numbers in the list. (An Integer is not considered to be Real, any more than a Real is considered to be Complex.) In[1]:= Out[1]= This command returns the number of summands that are powers. (Note that the first argument to Count need not be a list.) In[2]:= Out[2]= This returns the number of expressions that occur in the sum at any level and are powers. This count is higher; the actual matches can be seen by replacing Count with Cases. In[3]:= Out[3]=