This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.

# Count

 Countgives the number of elements in list that match pattern. Countgives the total number of subexpressions matching pattern that appear at the levels in expr specified by levelspec.
• Count uses standard level specifications:
 n levels 1 through n Infinity levels through Infinity {n} level n only {n1,n2} levels through
• The default value for levelspec in Count is .
• A positive level n consists of all parts of expr specified by n indices.
• A negative level -n consists of all parts of expr with depth n.
• Level -1 consists of numbers, symbols and other objects that do not have subparts.
• Level 0 corresponds to the whole expression.
• With the option setting Heads->True, Count looks at heads of expressions and their parts.
Count how many times occurs:
Count how many times occurs:
 Out[1]=
 Scope   (3)
Count works with patterns:
Count the number of elements not matching :
Count occurrences of down to level 2:
Count works with any head, not just List:
 Applications   (1)
Count the total number of symbols in an expression:
New in 1