NAME
    count - count elements of list or matrix satisfying a stated condition

SYNOPSIS
    count(x, y)

TYPES
    x		list or matrix
    y		string

    return	integer

DESCRIPTION
    For count(x, y), y is to be the name of a user-defined function;
    count(x,y) then returns the number of elements of x for which y
    tests as "true".

EXAMPLE
    > define f(a) = (a < 5)
    > A = list(1,2,7,6,4,8)
    > count(A, "f")
	3

LIMITS
    none

LIBRARY
    none

SEE ALSO
    select, modify