isFinite -- whether a number is finite

• Usage:

  isFinite x

• Inputs:
  • x, a number
• Outputs:
  • a Boolean value, whether x is finite, i.e., is not an infinite real number, nor not a number.

i1 : sqrt 2.

o1 = 1.414213562373095

o1 : RR (of precision 53)

i2 : isFinite oo

o2 = true

i3 : i = 1/0.

o3 = infinity

o3 : RR (of precision 53)

i4 : isFinite oo

o4 = false

i5 : i-i

o5 = NotANumber

o5 : RR (of precision 53)

i6 : isFinite oo

o6 = false