Method: Math#frexp

Defined in:
math.c

#frexp(x) ⇒ Array (private)

Returns a 2-element array containing the normalized signed float fraction and integer exponent of x such that:

x = fraction * 2**exponent

See IEEE 754 double-precision binary floating-point format: binary64.

  • Domain: [-INFINITY, INFINITY].

  • Range [-INFINITY, INFINITY].

Examples:

frexp(-INFINITY) # => [-Infinity, -1]
frexp(-2.0)      # => [-0.5, 2]
frexp(-1.0)      # => [-0.5, 1]
frexp(0.0)       # => [0.0, 0]
frexp(1.0)       # => [0.5, 1]
frexp(2.0)       # => [0.5, 2]
frexp(INFINITY)  # => [Infinity, -1]

Related: Math.ldexp (inverse of Math.frexp).

Returns:



782
783
784
785
786
787
788
789
790
 
# File 'math.c', line 782

static VALUE
math_frexp(VALUE unused_obj, VALUE x)
{
    double d;
    int exp;

    d = frexp(Get_Double(x), &exp);
    return rb_assoc_new(DBL2NUM(d), INT2NUM(exp));
}