RRSPACING (real-number)

  Class:  Elemental function - Generic

  Returns the reciprocal of the relative spacing of model numbers
  near the argument value.

  The result type is the same as the argument.  For information on
  the model for real numbers, see the HP Fortran for OpenVMS Language
  Reference Manual.

  Example:

  If -3.0 is a REAL*4 value, RRSPACING (-3.0) has the value 0.75 x
  2**24.