Float

Class

A Float object represents a sometimes-inexact real number using the native architecture’s double-precision floating point representation.

Floating point has a different arithmetic and is an inexact number. So you should know its esoteric system. See following:

You can create a Float object explicitly with:

A floating-point literal.

You can convert certain objects to Floats with:

Method Float.

What’s Here

First, what’s elsewhere. Class Float:

Inherits from class Numeric.

Here, class Float provides methods for:

Querying
Comparing
Converting

Querying

finite?

Returns whether self is finite.
hash

Returns the integer hash code for self.
infinite?

Returns whether self is infinite.
nan?

Returns whether self is a NaN (not-a-number).

Comparing

<

Returns whether self is less than the given value.
<=

Returns whether self is less than or equal to the given value.
<=>

Returns a number indicating whether self is less than, equal to, or greater than the given value.
== (aliased as === and eql>)

Returns whether self is equal to the given value.
>

Returns whether self is greater than the given value.
>=

Returns whether self is greater than or equal to the given value.

Converting

% (aliased as modulo)

Returns self modulo the given value.
*

Returns the product of self and the given value.
**

Returns the value of self raised to the power of the given value.
+

Returns the sum of self and the given value.
-

Returns the difference of self and the given value.
/

Returns the quotient of self and the given value.
ceil

Returns the smallest number greater than or equal to self.
coerce

Returns a 2-element array containing the given value converted to a Float and self
divmod

Returns a 2-element array containing the quotient and remainder results of dividing self by the given value.
fdiv

Returns the Float result of dividing self by the given value.
floor

Returns the greatest number smaller than or equal to self.
next_float

Returns the next-larger representable Float.
prev_float

Returns the next-smaller representable Float.
quo

Returns the quotient from dividing self by the given value.
round

Returns self rounded to the nearest value, to a given precision.
to_i (aliased as to_int)

Returns self truncated to an Integer.
to_s (aliased as inspect)

Returns a string containing the place-value representation of self in the given radix.
truncate

Returns self truncated to a given precision.

Constants

RADIX

The base of the floating point, or number of unique digits used to represent the number.

Usually defaults to 2 on most systems, which would represent a base-10 decimal.

MANT_DIG

The number of base digits for the double data type.

Usually defaults to 53.

DIG

The minimum number of significant decimal digits in a double-precision floating point.

Usually defaults to 15.

MIN_EXP

The smallest possible exponent value in a double-precision floating point.

Usually defaults to -1021.

MAX_EXP

The largest possible exponent value in a double-precision floating point.

Usually defaults to 1024.

MIN_10_EXP

The smallest negative exponent in a double-precision floating point where 10 raised to this power minus 1.

Usually defaults to -307.

MAX_10_EXP

The largest positive exponent in a double-precision floating point where 10 raised to this power minus 1.

Usually defaults to 308.

MIN

The smallest positive normalized number in a double-precision floating point.

Usually defaults to 2.2250738585072014e-308.

If the platform supports denormalized numbers, there are numbers between zero and Float::MIN. 0.0.next_float returns the smallest positive floating point number including denormalized numbers.

MAX

The largest possible integer in a double-precision floating point number.

Usually defaults to 1.7976931348623157e+308.

EPSILON

The difference between 1 and the smallest double-precision floating point number greater than 1.

Usually defaults to 2.2204460492503131e-16.

INFINITY

An expression representing positive infinity.

NAN

An expression representing a value which is “not a number”.

Instance Methods

self % other → float

numeric.c View on GitHub

          
            static VALUE
flo_mod(VALUE x, VALUE y)
{
    double fy;

    if (FIXNUM_P(y)) {
        fy = (double)FIX2LONG(y);
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        fy = rb_big2dbl(y);
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        fy = RFLOAT_VALUE(y);
    }
    else {
        return rb_num_coerce_bin(x, y, '%');
    }
    return DBL2NUM(ruby_float_mod(RFLOAT_VALUE(x), fy));
}

Returns self modulo other as a float.

For float f and real number r, these expressions are equivalent:

f % r
f-r*(f/r).floor
f.divmod(r)[1]

See Numeric#divmod.

Examples:

10.0 % 2              # => 0.0
10.0 % 3              # => 1.0
10.0 % 4              # => 2.0

10.0 % -2             # => 0.0
10.0 % -3             # => -2.0
10.0 % -4             # => -2.0

10.0 % 4.0            # => 2.0
10.0 % Rational(4, 1) # => 2.0

Float#modulo is an alias for Float#%.

self * other → numeric

numeric.c View on GitHub

          
            VALUE
rb_float_mul(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) * (double)FIX2LONG(y));
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) * rb_big2dbl(y));
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) * RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '*');
    }
}

Returns a new Float which is the product of self and other:

f = 3.14
f * 2              # => 6.28
f * 2.0            # => 6.28
f * Rational(1, 2) # => 1.57
f * Complex(2, 0)  # => (6.28+0.0i)

self ** other → numeric

numeric.c View on GitHub

          
            VALUE
rb_float_pow(VALUE x, VALUE y)
{
    double dx, dy;
    if (y == INT2FIX(2)) {
        dx = RFLOAT_VALUE(x);
        return DBL2NUM(dx * dx);
    }
    else if (FIXNUM_P(y)) {
        dx = RFLOAT_VALUE(x);
        dy = (double)FIX2LONG(y);
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        dx = RFLOAT_VALUE(x);
        dy = rb_big2dbl(y);
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        dx = RFLOAT_VALUE(x);
        dy = RFLOAT_VALUE(y);
        if (dx < 0 && dy != round(dy))
            return rb_dbl_complex_new_polar_pi(pow(-dx, dy), dy);
    }
    else {
        return rb_num_coerce_bin(x, y, idPow);
    }
    return DBL2NUM(pow(dx, dy));
}

Raises self to the power of other:

f = 3.14
f ** 2              # => 9.8596
f ** -2             # => 0.1014239928597509
f ** 2.1            # => 11.054834900588839
f ** Rational(2, 1) # => 9.8596
f ** Complex(2, 0)  # => (9.8596+0i)

self + other → numeric

numeric.c View on GitHub

          
            VALUE
rb_float_plus(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) + (double)FIX2LONG(y));
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) + rb_big2dbl(y));
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) + RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '+');
    }
}

Returns a new Float which is the sum of self and other:

f = 3.14
f + 1                 # => 4.140000000000001
f + 1.0               # => 4.140000000000001
f + Rational(1, 1)    # => 4.140000000000001
f + Complex(1, 0)     # => (4.140000000000001+0i)

self - other → numeric

numeric.c View on GitHub

          
            VALUE
rb_float_minus(VALUE x, VALUE y)
{
    if (FIXNUM_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) - (double)FIX2LONG(y));
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) - rb_big2dbl(y));
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        return DBL2NUM(RFLOAT_VALUE(x) - RFLOAT_VALUE(y));
    }
    else {
        return rb_num_coerce_bin(x, y, '-');
    }
}

Returns a new Float which is the difference of self and other:

f = 3.14
f - 1                 # => 2.14
f - 1.0               # => 2.14
f - Rational(1, 1)    # => 2.14
f - Complex(1, 0)     # => (2.14+0i)

-float → float

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 294
def -@
  Primitive.attr! 'inline'
  Primitive.cexpr! 'rb_float_uminus(self)'
end

Returns float, negated.

self / other → numeric

numeric.c View on GitHub

          
            VALUE
rb_float_div(VALUE x, VALUE y)
{
    double num = RFLOAT_VALUE(x);
    double den;
    double ret;

    if (FIXNUM_P(y)) {
        den = FIX2LONG(y);
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        den = rb_big2dbl(y);
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        den = RFLOAT_VALUE(y);
    }
    else {
        return rb_num_coerce_bin(x, y, '/');
    }

    ret = double_div_double(num, den);
    return DBL2NUM(ret);
}

Returns a new Float which is the result of dividing self by other:

f = 3.14
f / 2              # => 1.57
f / 2.0            # => 1.57
f / Rational(2, 1) # => 1.57
f / Complex(2, 0)  # => (1.57+0.0i)

self < other → true or false

numeric.c View on GitHub

          
            static VALUE
flo_lt(VALUE x, VALUE y)
{
    double a, b;

    a = RFLOAT_VALUE(x);
    if (RB_INTEGER_TYPE_P(y)) {
        VALUE rel = rb_integer_float_cmp(y, x);
        if (FIXNUM_P(rel))
            return RBOOL(-FIX2LONG(rel) < 0);
        return Qfalse;
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(b)) return Qfalse;
#endif
    }
    else {
        return rb_num_coerce_relop(x, y, '<');
    }
#if MSC_VERSION_BEFORE(1300)
    if (isnan(a)) return Qfalse;
#endif
    return RBOOL(a < b);
}

Returns true if self is numerically less than other:

2.0 < 3              # => true
2.0 < 3.0            # => true
2.0 < Rational(3, 1) # => true
2.0 < 2.0            # => false

Float::NAN < Float::NAN returns an implementation-dependent value.

self <= other → true or false

numeric.c View on GitHub

          
            static VALUE
flo_le(VALUE x, VALUE y)
{
    double a, b;

    a = RFLOAT_VALUE(x);
    if (RB_INTEGER_TYPE_P(y)) {
        VALUE rel = rb_integer_float_cmp(y, x);
        if (FIXNUM_P(rel))
            return RBOOL(-FIX2LONG(rel) <= 0);
        return Qfalse;
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(b)) return Qfalse;
#endif
    }
    else {
        return rb_num_coerce_relop(x, y, idLE);
    }
#if MSC_VERSION_BEFORE(1300)
    if (isnan(a)) return Qfalse;
#endif
    return RBOOL(a <= b);
}

Returns true if self is numerically less than or equal to other:

2.0 <= 3              # => true
2.0 <= 3.0            # => true
2.0 <= Rational(3, 1) # => true
2.0 <= 2.0            # => true
2.0 <= 1.0            # => false

Float::NAN <= Float::NAN returns an implementation-dependent value.

self <=> other → -1, 0, +1, or nil

numeric.c View on GitHub

          
            static VALUE
flo_cmp(VALUE x, VALUE y)
{
    double a, b;
    VALUE i;

    a = RFLOAT_VALUE(x);
    if (isnan(a)) return Qnil;
    if (RB_INTEGER_TYPE_P(y)) {
        VALUE rel = rb_integer_float_cmp(y, x);
        if (FIXNUM_P(rel))
            return LONG2FIX(-FIX2LONG(rel));
        return rel;
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
    }
    else {
        if (isinf(a) && (i = rb_check_funcall(y, rb_intern("infinite?"), 0, 0)) != Qundef) {
            if (RTEST(i)) {
                int j = rb_cmpint(i, x, y);
                j = (a > 0.0) ? (j > 0 ? 0 : +1) : (j < 0 ? 0 : -1);
                return INT2FIX(j);
            }
            if (a > 0.0) return INT2FIX(1);
            return INT2FIX(-1);
        }
        return rb_num_coerce_cmp(x, y, id_cmp);
    }
    return rb_dbl_cmp(a, b);
}

Returns a value that depends on the numeric relation between self and other:

-1, if self is less than other.
0, if self is equal to other.
1, if self is greater than other.
nil, if the two values are incommensurate.

Examples:

2.0 <=> 2              # => 0
2.0 <=> 2.0            # => 0
2.0 <=> Rational(2, 1) # => 0
2.0 <=> Complex(2, 0)  # => 0
2.0 <=> 1.9            # => 1
2.0 <=> 2.1            # => -1
2.0 <=> 'foo'          # => nil

This is the basis for the tests in the Comparable module.

Float::NAN <=> Float::NAN returns an implementation-dependent value.

self == other → true or false

numeric.c View on GitHub

          
            MJIT_FUNC_EXPORTED VALUE
rb_float_equal(VALUE x, VALUE y)
{
    volatile double a, b;

    if (RB_INTEGER_TYPE_P(y)) {
        return rb_integer_float_eq(y, x);
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(b)) return Qfalse;
#endif
    }
    else {
        return num_equal(x, y);
    }
    a = RFLOAT_VALUE(x);
#if MSC_VERSION_BEFORE(1300)
    if (isnan(a)) return Qfalse;
#endif
    return RBOOL(a == b);
}

Returns true if other has the same value as self, false otherwise:

2.0 == 2              # => true
2.0 == 2.0            # => true
2.0 == Rational(2, 1) # => true
2.0 == Complex(2, 0)  # => true

Float::NAN == Float::NAN returns an implementation-dependent value.

Related: Float#eql? (requires other to be a Float).

===(p1)

numeric.c View on GitHub

An alias for ==

self > other → true or false

numeric.c View on GitHub

          
            VALUE
rb_float_gt(VALUE x, VALUE y)
{
    double a, b;

    a = RFLOAT_VALUE(x);
    if (RB_INTEGER_TYPE_P(y)) {
        VALUE rel = rb_integer_float_cmp(y, x);
        if (FIXNUM_P(rel))
            return RBOOL(-FIX2LONG(rel) > 0);
        return Qfalse;
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(b)) return Qfalse;
#endif
    }
    else {
        return rb_num_coerce_relop(x, y, '>');
    }
#if MSC_VERSION_BEFORE(1300)
    if (isnan(a)) return Qfalse;
#endif
    return RBOOL(a > b);
}

Returns true if self is numerically greater than other:

2.0 > 1              # => true
2.0 > 1.0            # => true
2.0 > Rational(1, 2) # => true
2.0 > 2.0            # => false

Float::NAN > Float::NAN returns an implementation-dependent value.

self >= other → true or false

numeric.c View on GitHub

          
            static VALUE
flo_ge(VALUE x, VALUE y)
{
    double a, b;

    a = RFLOAT_VALUE(x);
    if (RB_TYPE_P(y, T_FIXNUM) || RB_BIGNUM_TYPE_P(y)) {
        VALUE rel = rb_integer_float_cmp(y, x);
        if (FIXNUM_P(rel))
            return RBOOL(-FIX2LONG(rel) >= 0);
        return Qfalse;
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(b)) return Qfalse;
#endif
    }
    else {
        return rb_num_coerce_relop(x, y, idGE);
    }
#if MSC_VERSION_BEFORE(1300)
    if (isnan(a)) return Qfalse;
#endif
    return RBOOL(a >= b);
}

Returns true if self is numerically greater than or equal to other:

2.0 >= 1              # => true
2.0 >= 1.0            # => true
2.0 >= Rational(1, 2) # => true
2.0 >= 2.0            # => true
2.0 >= 2.1            # => false

Float::NAN >= Float::NAN returns an implementation-dependent value.

float.abs → float

float.magnitude → float

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 278
def abs
  Primitive.attr! 'inline'
  Primitive.cexpr! 'rb_float_abs(self)'
end

Returns the absolute value of float.

(-34.56).abs   #=> 34.56
-34.56.abs     #=> 34.56
34.56.abs      #=> 34.56

Float#magnitude is an alias for Float#abs.

flo.angle → 0 or float

complex.c View on GitHub

An alias for arg

flo.arg → 0 or float

complex.c View on GitHub

          
            static VALUE
float_arg(VALUE self)
{
    if (isnan(RFLOAT_VALUE(self)))
        return self;
    if (f_tpositive_p(self))
        return INT2FIX(0);
    return rb_const_get(rb_mMath, id_PI);
}

Returns 0 if the value is positive, pi otherwise.

ceil(ndigits = 0) → float or integer

numeric.c View on GitHub

          
            static VALUE
flo_ceil(int argc, VALUE *argv, VALUE num)
{
    int ndigits = flo_ndigits(argc, argv);
    return rb_float_ceil(num, ndigits);
}

Returns the smallest number greater than or equal to self with a precision of ndigits decimal digits.

When ndigits is positive, returns a float with ndigits digits after the decimal point (as available):

f = 12345.6789
f.ceil(1) # => 12345.7
f.ceil(3) # => 12345.679
f = -12345.6789
f.ceil(1) # => -12345.6
f.ceil(3) # => -12345.678

When ndigits is non-positive, returns an integer with at least ndigits.abs trailing zeros:

f = 12345.6789
f.ceil(0)  # => 12346
f.ceil(-3) # => 13000
f = -12345.6789
f.ceil(0)  # => -12345
f.ceil(-3) # => -12000

Note that the limited precision of floating-point arithmetic may lead to surprising results:

(2.1 / 0.7).ceil  #=> 4 (!)

Related: Float#floor.

coerce(other) → array

numeric.c View on GitHub

          
            static VALUE
flo_coerce(VALUE x, VALUE y)
{
    return rb_assoc_new(rb_Float(y), x);
}

Returns a 2-element array containing other converted to a Float and self:

f = 3.14                 # => 3.14
f.coerce(2)              # => [2.0, 3.14]
f.coerce(2.0)            # => [2.0, 3.14]
f.coerce(Rational(1, 2)) # => [0.5, 3.14]
f.coerce(Complex(1, 0))  # => [1.0, 3.14]

Raises an exception if a type conversion fails.

flo.denominator → integer

rational.c View on GitHub

          
            VALUE
rb_float_denominator(VALUE self)
{
    double d = RFLOAT_VALUE(self);
    VALUE r;
    if (!isfinite(d))
        return INT2FIX(1);
    r = float_to_r(self);
    return nurat_denominator(r);
}

Returns the denominator (always positive). The result is machine dependent.

divmod(other) → array

numeric.c View on GitHub

          
            static VALUE
flo_divmod(VALUE x, VALUE y)
{
    double fy, div, mod;
    volatile VALUE a, b;

    if (FIXNUM_P(y)) {
        fy = (double)FIX2LONG(y);
    }
    else if (RB_BIGNUM_TYPE_P(y)) {
        fy = rb_big2dbl(y);
    }
    else if (RB_FLOAT_TYPE_P(y)) {
        fy = RFLOAT_VALUE(y);
    }
    else {
        return rb_num_coerce_bin(x, y, id_divmod);
    }
    flodivmod(RFLOAT_VALUE(x), fy, &div, &mod);
    a = dbl2ival(div);
    b = DBL2NUM(mod);
    return rb_assoc_new(a, b);
}

Returns a 2-element array [q, r], where

q = (self/other).floor      # Quotient
r = self % other            # Remainder

Examples:

11.0.divmod(4)              # => [2, 3.0]
11.0.divmod(-4)             # => [-3, -1.0]
-11.0.divmod(4)             # => [-3, 1.0]
-11.0.divmod(-4)            # => [2, -3.0]

12.0.divmod(4)              # => [3, 0.0]
12.0.divmod(-4)             # => [-3, 0.0]
-12.0.divmod(4)             # => [-3, -0.0]
-12.0.divmod(-4)            # => [3, -0.0]

13.0.divmod(4.0)            # => [3, 1.0]
13.0.divmod(Rational(4, 1)) # => [3, 1.0]

eql?(other) → true or false

numeric.c View on GitHub

          
            MJIT_FUNC_EXPORTED VALUE
rb_float_eql(VALUE x, VALUE y)
{
    if (RB_FLOAT_TYPE_P(y)) {
        double a = RFLOAT_VALUE(x);
        double b = RFLOAT_VALUE(y);
#if MSC_VERSION_BEFORE(1300)
        if (isnan(a) || isnan(b)) return Qfalse;
#endif
    return RBOOL(a == b);
    }
    return Qfalse;
}

Returns true if other is a Float with the same value as self, false otherwise:

2.0.eql?(2.0)            # => true
2.0.eql?(1.0)            # => false
2.0.eql?(1)              # => false
2.0.eql?(Rational(2, 1)) # => false
2.0.eql?(Complex(2, 0))  # => false

Float::NAN.eql?(Float::NAN) returns an implementation-dependent value.

Related: Float#== (performs type conversions).

fdiv(p1)

numeric.c View on GitHub

An alias for quo

finite? → true or false

numeric.c View on GitHub

          
            VALUE
rb_flo_is_finite_p(VALUE num)
{
    double value = RFLOAT_VALUE(num);

    return RBOOL(isfinite(value));
}

Returns true if self is not Infinity, -Infinity, or Nan, false otherwise:

f = 2.0      # => 2.0
f.finite?    # => true
f = 1.0/0.0  # => Infinity
f.finite?    # => false
f = -1.0/0.0 # => -Infinity
f.finite?    # => false
f = 0.0/0.0  # => NaN
f.finite?    # => false

floor(ndigits = 0) → float or integer

numeric.c View on GitHub

          
            static VALUE
flo_floor(int argc, VALUE *argv, VALUE num)
{
    int ndigits = flo_ndigits(argc, argv);
    return rb_float_floor(num, ndigits);
}

Returns the largest number less than or equal to self with a precision of ndigits decimal digits.

When ndigits is positive, returns a float with ndigits digits after the decimal point (as available):

f = 12345.6789
f.floor(1) # => 12345.6
f.floor(3) # => 12345.678
f = -12345.6789
f.floor(1) # => -12345.7
f.floor(3) # => -12345.679

When ndigits is non-positive, returns an integer with at least ndigits.abs trailing zeros:

f = 12345.6789
f.floor(0)  # => 12345
f.floor(-3) # => 12000
f = -12345.6789
f.floor(0)  # => -12346
f.floor(-3) # => -13000

Note that the limited precision of floating-point arithmetic may lead to surprising results:

(0.3 / 0.1).floor  #=> 2 (!)

Related: Float#ceil.

hash → integer

numeric.c View on GitHub

          
            static VALUE
flo_hash(VALUE num)
{
    return rb_dbl_hash(RFLOAT_VALUE(num));
}

Returns the integer hash value for self.

infinite? → -1, 1, or nil

numeric.c View on GitHub

          
            VALUE
rb_flo_is_infinite_p(VALUE num)
{
    double value = RFLOAT_VALUE(num);

    if (isinf(value)) {
        return INT2FIX( value < 0 ? -1 : 1 );
    }

    return Qnil;
}

Returns:

1, if self is Infinity.
-1 if self is -Infinity.
nil, otherwise.

Examples:

f = 1.0/0.0  # => Infinity
f.infinite?  # => 1
f = -1.0/0.0 # => -Infinity
f.infinite?  # => -1
f = 1.0      # => 1.0
f.infinite?  # => nil
f = 0.0/0.0  # => NaN
f.infinite?  # => nil

inspect

numeric.c View on GitHub

An alias for to_s

magnitude

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 283
def magnitude
  Primitive.attr! 'inline'
  Primitive.cexpr! 'rb_float_abs(self)'
end

No documentation available

modulo(p1)

numeric.c View on GitHub

An alias for %

nan? → true or false

numeric.c View on GitHub

          
            static VALUE
flo_is_nan_p(VALUE num)
{
    double value = RFLOAT_VALUE(num);

    return RBOOL(isnan(value));
}

Returns true if self is a NaN, false otherwise.

f = -1.0     #=> -1.0
f.nan?       #=> false
f = 0.0/0.0  #=> NaN
f.nan?       #=> true

float.negative? → true or false

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 327
def negative?
  Primitive.attr! 'inline'
  Primitive.cexpr! 'RBOOL(RFLOAT_VALUE(self) < 0.0)'
end

Returns true if float is less than 0.

next_float → float

numeric.c View on GitHub

          
            static VALUE
flo_next_float(VALUE vx)
{
    return flo_nextafter(vx, HUGE_VAL);
}

Returns the next-larger representable Float.

These examples show the internally stored values (64-bit hexadecimal) for each Float f and for the corresponding f.next_float:

f = 0.0      # 0x0000000000000000
f.next_float # 0x0000000000000001

f = 0.01     # 0x3f847ae147ae147b
f.next_float # 0x3f847ae147ae147c

In the remaining examples here, the output is shown in the usual way (result to_s):

0.01.next_float    # => 0.010000000000000002
1.0.next_float     # => 1.0000000000000002
100.0.next_float   # => 100.00000000000001

f = 0.01
(0..3).each_with_index {|i| printf "%2d %-20a %s\n", i, f, f.to_s; f = f.next_float }

Output:

 0 0x1.47ae147ae147bp-7 0.01
 1 0x1.47ae147ae147cp-7 0.010000000000000002
 2 0x1.47ae147ae147dp-7 0.010000000000000004
 3 0x1.47ae147ae147ep-7 0.010000000000000005

f = 0.0; 100.times { f += 0.1 }
f                           # => 9.99999999999998       # should be 10.0 in the ideal world.
10-f                        # => 1.9539925233402755e-14 # the floating point error.
10.0.next_float-10          # => 1.7763568394002505e-15 # 1 ulp (unit in the last place).
(10-f)/(10.0.next_float-10) # => 11.0                   # the error is 11 ulp.
(10-f)/(10*Float::EPSILON)  # => 8.8                    # approximation of the above.
"%a" % 10                   # => "0x1.4p+3"
"%a" % f                    # => "0x1.3fffffffffff5p+3" # the last hex digit is 5.  16 - 5 = 11 ulp.

Related: Float#prev_float

flo.numerator → integer

rational.c View on GitHub

          
            VALUE
rb_float_numerator(VALUE self)
{
    double d = RFLOAT_VALUE(self);
    VALUE r;
    if (!isfinite(d))
        return self;
    r = float_to_r(self);
    return nurat_numerator(r);
}

Returns the numerator. The result is machine dependent.

n = 0.3.numerator    #=> 5404319552844595
d = 0.3.denominator  #=> 18014398509481984
n.fdiv(d)            #=> 0.3

flo.phase → 0 or float

complex.c View on GitHub

An alias for arg

float.positive? → true or false

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 316
def positive?
  Primitive.attr! 'inline'
  Primitive.cexpr! 'RBOOL(RFLOAT_VALUE(self) > 0.0)'
end

Returns true if float is greater than 0.

float.prev_float → float

numeric.c View on GitHub

          
            static VALUE
flo_prev_float(VALUE vx)
{
    return flo_nextafter(vx, -HUGE_VAL);
}

Returns the next-smaller representable Float.

These examples show the internally stored values (64-bit hexadecimal) for each Float f and for the corresponding f.pev_float:

f = 5e-324   # 0x0000000000000001
f.prev_float # 0x0000000000000000

f = 0.01     # 0x3f847ae147ae147b
f.prev_float # 0x3f847ae147ae147a

In the remaining examples here, the output is shown in the usual way (result to_s):

0.01.prev_float   # => 0.009999999999999998
1.0.prev_float    # => 0.9999999999999999
100.0.prev_float  # => 99.99999999999999

f = 0.01
(0..3).each_with_index {|i| printf "%2d %-20a %s\n", i, f, f.to_s; f = f.prev_float }

Output:

0 0x1.47ae147ae147bp-7 0.01
1 0x1.47ae147ae147ap-7 0.009999999999999998
2 0x1.47ae147ae1479p-7 0.009999999999999997
3 0x1.47ae147ae1478p-7 0.009999999999999995

Related: Float#next_float.

quo(other) → numeric

numeric.c View on GitHub

          
            static VALUE
flo_quo(VALUE x, VALUE y)
{
    return num_funcall1(x, '/', y);
}

Returns the quotient from dividing self by other:

f = 3.14
f.quo(2)              # => 1.57
f.quo(-2)             # => -1.57
f.quo(Rational(2, 1)) # => 1.57
f.quo(Complex(2, 0))  # => (1.57+0.0i)

Float#fdiv is an alias for Float#quo.

flt.rationalize([eps]) → rational

rational.c View on GitHub

          
            static VALUE
float_rationalize(int argc, VALUE *argv, VALUE self)
{
    double d = RFLOAT_VALUE(self);
    VALUE rat;
    int neg = d < 0.0;
    if (neg) self = DBL2NUM(-d);

    if (rb_check_arity(argc, 0, 1)) {
        rat = rb_flt_rationalize_with_prec(self, argv[0]);
    }
    else {
        rat = rb_flt_rationalize(self);
    }
    if (neg) RATIONAL_SET_NUM(rat, rb_int_uminus(RRATIONAL(rat)->num));
    return rat;
}

Returns a simpler approximation of the value (flt-|eps| <= result <= flt+|eps|). If the optional argument eps is not given, it will be chosen automatically.

0.3.rationalize          #=> (3/10)
1.333.rationalize        #=> (1333/1000)
1.333.rationalize(0.01)  #=> (4/3)

round(ndigits = 0, half: :up]) → integer or float

numeric.c View on GitHub

          
            static VALUE
flo_round(int argc, VALUE *argv, VALUE num)
{
    double number, f, x;
    VALUE nd, opt;
    int ndigits = 0;
    enum ruby_num_rounding_mode mode;

    if (rb_scan_args(argc, argv, "01:", &nd, &opt)) {
        ndigits = NUM2INT(nd);
    }
    mode = rb_num_get_rounding_option(opt);
    number = RFLOAT_VALUE(num);
    if (number == 0.0) {
        return ndigits > 0 ? DBL2NUM(number) : INT2FIX(0);
    }
    if (ndigits < 0) {
        return rb_int_round(flo_to_i(num), ndigits, mode);
    }
    if (ndigits == 0) {
        x = ROUND_CALL(mode, round, (number, 1.0));
        return dbl2ival(x);
    }
    if (isfinite(number)) {
        int binexp;
        frexp(number, &binexp);
        if (float_round_overflow(ndigits, binexp)) return num;
        if (float_round_underflow(ndigits, binexp)) return DBL2NUM(0);
        if (ndigits > 14) {
            /* In this case, pow(10, ndigits) may not be accurate. */
            return rb_flo_round_by_rational(argc, argv, num);
        }
        f = pow(10, ndigits);
        x = ROUND_CALL(mode, round, (number, f));
        return DBL2NUM(x / f);
    }
    return num;
}

Returns self rounded to the nearest value with a precision of ndigits decimal digits.

When ndigits is non-negative, returns a float with ndigits after the decimal point (as available):

f = 12345.6789
f.round(1) # => 12345.7
f.round(3) # => 12345.679
f = -12345.6789
f.round(1) # => -12345.7
f.round(3) # => -12345.679

When ndigits is negative, returns an integer with at least ndigits.abs trailing zeros:

f = 12345.6789
f.round(0)  # => 12346
f.round(-3) # => 12000
f = -12345.6789
f.round(0)  # => -12346
f.round(-3) # => -12000

If keyword argument half is given, and self is equidistant from the two candidate values, the rounding is according to the given half value:

:up or nil: round away from zero:

2.5.round(half: :up)      # => 3
3.5.round(half: :up)      # => 4
(-2.5).round(half: :up)   # => -3

:down: round toward zero:

2.5.round(half: :down)    # => 2
3.5.round(half: :down)    # => 3
(-2.5).round(half: :down) # => -2

:even: round toward the candidate whose last nonzero digit is even:

2.5.round(half: :even)    # => 2
3.5.round(half: :even)    # => 4
(-2.5).round(half: :even) # => -2

Raises and exception if the value for half is invalid.

Related: Float#truncate.

float.to_d → bigdecimal

float.to_d(precision) → bigdecimal

ext/bigdecimal/lib/bigdecimal/util.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/ext/bigdecimal/lib/bigdecimal/util.rb, line 46
def to_d(precision=0)
  BigDecimal(self, precision)
end

Returns the value of float as a BigDecimal. The precision parameter is used to determine the number of significant digits for the result (the default is Float::DIG).

require 'bigdecimal'
require 'bigdecimal/util'

0.5.to_d         # => 0.5e0
1.234.to_d(2)    # => 0.12e1

float.to_f → self

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 261
def to_f
  return self
end

Since float is already a Float, returns self.

to_i → integer

numeric.c View on GitHub

          
            static VALUE
flo_to_i(VALUE num)
{
    double f = RFLOAT_VALUE(num);

    if (f > 0.0) f = floor(f);
    if (f < 0.0) f = ceil(f);

    return dbl2ival(f);
}

Returns self truncated to an Integer.

1.2.to_i    # => 1
(-1.2).to_i # => -1

Note that the limited precision of floating-point arithmetic may lead to surprising results:

(0.3 / 0.1).to_i  # => 2 (!)

Float#to_int is an alias for Float#to_i.

to_int

numeric.c View on GitHub

An alias for to_i

flt.to_r → rational

rational.c View on GitHub

          
            static VALUE
float_to_r(VALUE self)
{
    VALUE f;
    int n;

    float_decode_internal(self, &f, &n);
#if FLT_RADIX == 2
    if (n == 0)
        return rb_rational_new1(f);
    if (n > 0)
        return rb_rational_new1(rb_int_lshift(f, INT2FIX(n)));
    n = -n;
    return rb_rational_new2(f, rb_int_lshift(ONE, INT2FIX(n)));
#else
    f = rb_int_mul(f, rb_int_pow(INT2FIX(FLT_RADIX), n));
    if (RB_TYPE_P(f, T_RATIONAL))
        return f;
    return rb_rational_new1(f);
#endif
}

Returns the value as a rational.

2.0.to_r    #=> (2/1)
2.5.to_r    #=> (5/2)
-0.75.to_r  #=> (-3/4)
0.0.to_r    #=> (0/1)
0.3.to_r    #=> (5404319552844595/18014398509481984)

NOTE: 0.3.to_r isn’t the same as “0.3”.to_r. The latter is equivalent to “3/10”.to_r, but the former isn’t so.

0.3.to_r   == 3/10r  #=> false
"0.3".to_r == 3/10r  #=> true

to_s → string

numeric.c View on GitHub

          
            static VALUE
flo_to_s(VALUE flt)
{
    enum {decimal_mant = DBL_MANT_DIG-DBL_DIG};
    enum {float_dig = DBL_DIG+1};
    char buf[float_dig + (decimal_mant + CHAR_BIT - 1) / CHAR_BIT + 10];
    double value = RFLOAT_VALUE(flt);
    VALUE s;
    char *p, *e;
    int sign, decpt, digs;

    if (isinf(value)) {
        static const char minf[] = "-Infinity";
        const int pos = (value > 0); /* skip "-" */
        return rb_usascii_str_new(minf+pos, strlen(minf)-pos);
    }
    else if (isnan(value))
        return rb_usascii_str_new2("NaN");

    p = ruby_dtoa(value, 0, 0, &decpt, &sign, &e);
    s = sign ? rb_usascii_str_new_cstr("-") : rb_usascii_str_new(0, 0);
    if ((digs = (int)(e - p)) >= (int)sizeof(buf)) digs = (int)sizeof(buf) - 1;
    memcpy(buf, p, digs);
    xfree(p);
    if (decpt > 0) {
        if (decpt < digs) {
            memmove(buf + decpt + 1, buf + decpt, digs - decpt);
            buf[decpt] = '.';
            rb_str_cat(s, buf, digs + 1);
        }
        else if (decpt <= DBL_DIG) {
            long len;
            char *ptr;
            rb_str_cat(s, buf, digs);
            rb_str_resize(s, (len = RSTRING_LEN(s)) + decpt - digs + 2);
            ptr = RSTRING_PTR(s) + len;
            if (decpt > digs) {
                memset(ptr, '0', decpt - digs);
                ptr += decpt - digs;
            }
            memcpy(ptr, ".0", 2);
        }
        else {
            goto exp;
        }
    }
    else if (decpt > -4) {
        long len;
        char *ptr;
        rb_str_cat(s, "0.", 2);
        rb_str_resize(s, (len = RSTRING_LEN(s)) - decpt + digs);
        ptr = RSTRING_PTR(s);
        memset(ptr += len, '0', -decpt);
        memcpy(ptr -= decpt, buf, digs);
    }
    else {
        goto exp;
    }
    return s;

  exp:
    if (digs > 1) {
        memmove(buf + 2, buf + 1, digs - 1);
    }
    else {
        buf[2] = '0';
        digs++;
    }
    buf[1] = '.';
    rb_str_cat(s, buf, digs + 1);
    rb_str_catf(s, "e%+03d", decpt - 1);
    return s;
}

Returns a string containing a representation of self; depending of the value of self, the string representation may contain:

A fixed-point number.
A number in “scientific notation” (containing an exponent).
‘Infinity’.
‘-Infinity’.
‘NaN’ (indicating not-a-number).

3.14.to_s # => “3.14” (10.1**50).to_s # => “1.644631821843879e+50” (10.1**500).to_s # => “Infinity” (-10.1**500).to_s # => “-Infinity” (0.0/0.0).to_s # => “NaN”

truncate(ndigits = 0) → float or integer

numeric.c View on GitHub

          
            static VALUE
flo_truncate(int argc, VALUE *argv, VALUE num)
{
    if (signbit(RFLOAT_VALUE(num)))
        return flo_ceil(argc, argv, num);
    else
        return flo_floor(argc, argv, num);
}

Returns self truncated (toward zero) to a precision of ndigits decimal digits.

When ndigits is positive, returns a float with ndigits digits after the decimal point (as available):

f = 12345.6789
f.truncate(1) # => 12345.6
f.truncate(3) # => 12345.678
f = -12345.6789
f.truncate(1) # => -12345.6
f.truncate(3) # => -12345.678

When ndigits is negative, returns an integer with at least ndigits.abs trailing zeros:

f = 12345.6789
f.truncate(0)  # => 12345
f.truncate(-3) # => 12000
f = -12345.6789
f.truncate(0)  # => -12345
f.truncate(-3) # => -12000

Note that the limited precision of floating-point arithmetic may lead to surprising results:

(0.3 / 0.1).truncate  #=> 2 (!)

Related: Float#round.

float.zero? → true or false

numeric.rb View on GitHub

          
            # File tmp/rubies/ruby-3.1.3/numeric.rb, line 305
def zero?
  Primitive.attr! 'inline'
  Primitive.cexpr! 'RBOOL(FLOAT_ZERO_P(self))'
end

Returns true if float is 0.0.