Provided by: ocaml-man_4.13.1-4ubuntu1_all 
NAME
Float - Floating-point arithmetic.
Module
Module Float
Documentation
Module Float
: sig end
Floating-point arithmetic.
OCaml's floating-point numbers follow the IEEE 754 standard, using double precision (64
bits) numbers. Floating-point operations never raise an exception on overflow, underflow,
division by zero, etc. Instead, special IEEE numbers are returned as appropriate, such as
infinity for 1.0 /. 0.0 , neg_infinity for -1.0 /. 0.0 , and nan ('not a number') for 0.0
/. 0.0 . These special numbers then propagate through floating-point computations as
expected: for instance, 1.0 /. infinity is 0.0 , basic arithmetic operations ( +. , -. ,
*. , /. ) with nan as an argument return nan , ...
Since 4.07.0
val zero : float
The floating point 0.
Since 4.08.0
val one : float
The floating-point 1.
Since 4.08.0
val minus_one : float
The floating-point -1.
Since 4.08.0
val neg : float -> float
Unary negation.
val add : float -> float -> float
Floating-point addition.
val sub : float -> float -> float
Floating-point subtraction.
val mul : float -> float -> float
Floating-point multiplication.
val div : float -> float -> float
Floating-point division.
val fma : float -> float -> float -> float
fma x y z returns x * y + z , with a best effort for computing this expression with a
single rounding, using either hardware instructions (providing full IEEE compliance) or a
software emulation.
On 64-bit Cygwin, 64-bit mingw-w64 and MSVC 2017 and earlier, this function may be
emulated owing to known bugs on limitations on these platforms. Note: since software
emulation of the fma is costly, make sure that you are using hardware fma support if
performance matters.
Since 4.08.0
val rem : float -> float -> float
rem a b returns the remainder of a with respect to b . The returned value is a -. n *. b
, where n is the quotient a /. b rounded towards zero to an integer.
val succ : float -> float
succ x returns the floating point number right after x i.e., the smallest floating-point
number greater than x . See also Float.next_after .
Since 4.08.0
val pred : float -> float
pred x returns the floating-point number right before x i.e., the greatest floating-point
number smaller than x . See also Float.next_after .
Since 4.08.0
val abs : float -> float
abs f returns the absolute value of f .
val infinity : float
Positive infinity.
val neg_infinity : float
Negative infinity.
val nan : float
A special floating-point value denoting the result of an undefined operation such as 0.0
/. 0.0 . Stands for 'not a number'. Any floating-point operation with nan as argument
returns nan as result. As for floating-point comparisons, = , < , <= , > and >= return
false and <> returns true if one or both of their arguments is nan .
val pi : float
The constant pi.
val max_float : float
The largest positive finite value of type float .
val min_float : float
The smallest positive, non-zero, non-denormalized value of type float .
val epsilon : float
The difference between 1.0 and the smallest exactly representable floating-point number
greater than 1.0 .
val is_finite : float -> bool
is_finite x is true if and only if x is finite i.e., not infinite and not Float.nan .
Since 4.08.0
val is_infinite : float -> bool
is_infinite x is true if and only if x is Float.infinity or Float.neg_infinity .
Since 4.08.0
val is_nan : float -> bool
is_nan x is true if and only if x is not a number (see Float.nan ).
Since 4.08.0
val is_integer : float -> bool
is_integer x is true if and only if x is an integer.
Since 4.08.0
val of_int : int -> float
Convert an integer to floating-point.
val to_int : float -> int
Truncate the given floating-point number to an integer. The result is unspecified if the
argument is nan or falls outside the range of representable integers.
val of_string : string -> float
Convert the given string to a float. The string is read in decimal (by default) or in
hexadecimal (marked by 0x or 0X ). The format of decimal floating-point numbers is [-]
dd.ddd (e|E) [+|-] dd , where d stands for a decimal digit. The format of hexadecimal
floating-point numbers is [-] 0(x|X) hh.hhh (p|P) [+|-] dd , where h stands for an
hexadecimal digit and d for a decimal digit. In both cases, at least one of the integer
and fractional parts must be given; the exponent part is optional. The _ (underscore)
character can appear anywhere in the string and is ignored. Depending on the execution
platforms, other representations of floating-point numbers can be accepted, but should not
be relied upon.
Raises Failure if the given string is not a valid representation of a float.
val of_string_opt : string -> float option
Same as of_string , but returns None instead of raising.
val to_string : float -> string
Return the string representation of a floating-point number.
type fpclass = fpclass =
| FP_normal (* Normal number, none of the below
*)
| FP_subnormal (* Number very close to 0.0, has reduced precision
*)
| FP_zero (* Number is 0.0 or -0.0
*)
| FP_infinite (* Number is positive or negative infinity
*)
| FP_nan (* Not a number: result of an undefined operation
*)
The five classes of floating-point numbers, as determined by the Float.classify_float
function.
val classify_float : float -> fpclass
Return the class of the given floating-point number: normal, subnormal, zero, infinite, or
not a number.
val pow : float -> float -> float
Exponentiation.
val sqrt : float -> float
Square root.
val cbrt : float -> float
Cube root.
Since 4.13.0
val exp : float -> float
Exponential.
val exp2 : float -> float
Base 2 exponential function.
Since 4.13.0
val log : float -> float
Natural logarithm.
val log10 : float -> float
Base 10 logarithm.
val log2 : float -> float
Base 2 logarithm.
Since 4.13.0
val expm1 : float -> float
expm1 x computes exp x -. 1.0 , giving numerically-accurate results even if x is close to
0.0 .
val log1p : float -> float
log1p x computes log(1.0 +. x) (natural logarithm), giving numerically-accurate results
even if x is close to 0.0 .
val cos : float -> float
Cosine. Argument is in radians.
val sin : float -> float
Sine. Argument is in radians.
val tan : float -> float
Tangent. Argument is in radians.
val acos : float -> float
Arc cosine. The argument must fall within the range [-1.0, 1.0] . Result is in radians
and is between 0.0 and pi .
val asin : float -> float
Arc sine. The argument must fall within the range [-1.0, 1.0] . Result is in radians and
is between -pi/2 and pi/2 .
val atan : float -> float
Arc tangent. Result is in radians and is between -pi/2 and pi/2 .
val atan2 : float -> float -> float
atan2 y x returns the arc tangent of y /. x . The signs of x and y are used to determine
the quadrant of the result. Result is in radians and is between -pi and pi .
val hypot : float -> float -> float
hypot x y returns sqrt(x *. x + y *. y) , that is, the length of the hypotenuse of a
right-angled triangle with sides of length x and y , or, equivalently, the distance of the
point (x,y) to origin. If one of x or y is infinite, returns infinity even if the other
is nan .
val cosh : float -> float
Hyperbolic cosine. Argument is in radians.
val sinh : float -> float
Hyperbolic sine. Argument is in radians.
val tanh : float -> float
Hyperbolic tangent. Argument is in radians.
val acosh : float -> float
Hyperbolic arc cosine. The argument must fall within the range [1.0, inf] . Result is in
radians and is between 0.0 and inf .
Since 4.13.0
val asinh : float -> float
Hyperbolic arc sine. The argument and result range over the entire real line. Result is
in radians.
Since 4.13.0
val atanh : float -> float
Hyperbolic arc tangent. The argument must fall within the range [-1.0, 1.0] . Result is
in radians and ranges over the entire real line.
Since 4.13.0
val erf : float -> float
Error function. The argument ranges over the entire real line. The result is always
within [-1.0, 1.0] .
Since 4.13.0
val erfc : float -> float
Complementary error function ( erfc x = 1 - erf x ). The argument ranges over the entire
real line. The result is always within [-1.0, 1.0] .
Since 4.13.0
val trunc : float -> float
trunc x rounds x to the nearest integer whose absolute value is less than or equal to x .
Since 4.08.0
val round : float -> float
round x rounds x to the nearest integer with ties (fractional values of 0.5) rounded away
from zero, regardless of the current rounding direction. If x is an integer, +0. , -0.
, nan , or infinite, x itself is returned.
On 64-bit mingw-w64, this function may be emulated owing to a bug in the C runtime library
(CRT) on this platform.
Since 4.08.0
val ceil : float -> float
Round above to an integer value. ceil f returns the least integer value greater than or
equal to f . The result is returned as a float.
val floor : float -> float
Round below to an integer value. floor f returns the greatest integer value less than or
equal to f . The result is returned as a float.
val next_after : float -> float -> float
next_after x y returns the next representable floating-point value following x in the
direction of y . More precisely, if y is greater (resp. less) than x , it returns the
smallest (resp. largest) representable number greater (resp. less) than x . If x equals y
, the function returns y . If x or y is nan , a nan is returned. Note that next_after
max_float infinity = infinity and that next_after 0. infinity is the smallest denormalized
positive number. If x is the smallest denormalized positive number, next_after x 0. = 0.
Since 4.08.0
val copy_sign : float -> float -> float
copy_sign x y returns a float whose absolute value is that of x and whose sign is that of
y . If x is nan , returns nan . If y is nan , returns either x or -. x , but it is not
specified which.
val sign_bit : float -> bool
sign_bit x is true if and only if the sign bit of x is set. For example sign_bit 1. and
signbit 0. are false while sign_bit (-1.) and sign_bit (-0.) are true .
Since 4.08.0
val frexp : float -> float * int
frexp f returns the pair of the significant and the exponent of f . When f is zero, the
significant x and the exponent n of f are equal to zero. When f is non-zero, they are
defined by f = x *. 2 ** n and 0.5 <= x < 1.0 .
val ldexp : float -> int -> float
ldexp x n returns x *. 2 ** n .
val modf : float -> float * float
modf f returns the pair of the fractional and integral part of f .
type t = float
An alias for the type of floating-point numbers.
val compare : t -> t -> int
compare x y returns 0 if x is equal to y , a negative integer if x is less than y , and a
positive integer if x is greater than y . compare treats nan as equal to itself and less
than any other float value. This treatment of nan ensures that compare defines a total
ordering relation.
val equal : t -> t -> bool
The equal function for floating-point numbers, compared using Float.compare .
val min : t -> t -> t
min x y returns the minimum of x and y . It returns nan when x or y is nan . Moreover
min (-0.) (+0.) = -0.
Since 4.08.0
val max : float -> float -> float
max x y returns the maximum of x and y . It returns nan when x or y is nan . Moreover
max (-0.) (+0.) = +0.
Since 4.08.0
val min_max : float -> float -> float * float
min_max x y is (min x y, max x y) , just more efficient.
Since 4.08.0
val min_num : t -> t -> t
min_num x y returns the minimum of x and y treating nan as missing values. If both x and
y are nan , nan is returned. Moreover min_num (-0.) (+0.) = -0.
Since 4.08.0
val max_num : t -> t -> t
max_num x y returns the maximum of x and y treating nan as missing values. If both x and
y are nan nan is returned. Moreover max_num (-0.) (+0.) = +0.
Since 4.08.0
val min_max_num : float -> float -> float * float
min_max_num x y is (min_num x y, max_num x y) , just more efficient. Note that in
particular min_max_num x nan = (x, x) and min_max_num nan y = (y, y) .
Since 4.08.0
val hash : t -> int
The hash function for floating-point numbers.
module Array : sig end
Float arrays with packed representation.
module ArrayLabels : sig end
Float arrays with packed representation (labeled functions).