any(BasicList,Function) -- whether any elements of a list satisfy a specified condition

Synopsis

• Function: any

• Usage:

  any(L,f)

• Inputs:
  • L, a basic list, or an integer. If an integer is given, then the sequence 0..L-1 is used.
  • f, a function, which returns true or false
• Outputs:
  • a Boolean value, true if f returns true when applied to any element of L and false otherwise

Description

i1 : any({1,2,3,4}, even)

o1 = true

i2 : any({1,3,5,7}, even)

o2 = false

i3 : any(20,n -> n == 15)

o3 = true

We can test whether a permutation has a fixed point as follows.

i4 : fp = x -> any(#x, i -> x#i == i);

i5 : fp {2,3,4,0,1}

o5 = false

i6 : fp {2,4,0,3,1}

o6 = true

See also

• scan -- apply a function to each element in a list or sequence
• apply -- apply a function to each element
• select -- select from a list, hash table, or string
• any -- whether any elements satisfy a specified condition
• member -- test membership in a list or set