Copyright | (c) The University of Glasgow 1994-2002 |
---|---|
License | see libraries/base/LICENSE |
Maintainer | cvs-ghc@haskell.org |
Stability | internal |
Portability | non-portable (GHC Extensions) |
Safe Haskell | Trustworthy |
Language | Haskell2010 |
Synopsis
- divZeroError :: a
- ratioZeroDenominatorError :: a
- overflowError :: a
- underflowError :: a
- data Ratio a = !a :% !a
- type Rational = Ratio Integer
- ratioPrec :: Int
- ratioPrec1 :: Int
- infinity :: Rational
- notANumber :: Rational
- (%) :: Integral a => a -> a -> Ratio a
- numerator :: Ratio a -> a
- denominator :: Ratio a -> a
- reduce :: Integral a => a -> a -> Ratio a
- class (Num a, Ord a) => Real a where
- toRational :: a -> Rational
- class (Real a, Enum a) => Integral a where
- class Num a => Fractional a where
- (/) :: a -> a -> a
- recip :: a -> a
- fromRational :: Rational -> a
- class (Real a, Fractional a) => RealFrac a where
- numericEnumFrom :: Fractional a => a -> [a]
- numericEnumFromThen :: Fractional a => a -> a -> [a]
- numericEnumFromTo :: (Ord a, Fractional a) => a -> a -> [a]
- numericEnumFromThenTo :: (Ord a, Fractional a) => a -> a -> a -> [a]
- fromIntegral :: (Integral a, Num b) => a -> b
- realToFrac :: (Real a, Fractional b) => a -> b
- showSigned :: Real a => (a -> ShowS) -> Int -> a -> ShowS
- even :: Integral a => a -> Bool
- odd :: Integral a => a -> Bool
- (^) :: (Num a, Integral b) => a -> b -> a
- (^^) :: (Fractional a, Integral b) => a -> b -> a
- (^%^) :: Integral a => Rational -> a -> Rational
- (^^%^^) :: Integral a => Rational -> a -> Rational
- gcd :: Integral a => a -> a -> a
- lcm :: Integral a => a -> a -> a
- gcdInt' :: Int -> Int -> Int
- gcdWord' :: Word -> Word -> Word
- integralEnumFrom :: (Integral a, Bounded a) => a -> [a]
- integralEnumFromThen :: (Integral a, Bounded a) => a -> a -> [a]
- integralEnumFromTo :: Integral a => a -> a -> [a]
- integralEnumFromThenTo :: Integral a => a -> a -> a -> [a]
Documentation
divZeroError :: a Source #
overflowError :: a Source #
underflowError :: a Source #
Rational numbers, with numerator and denominator of some Integral
type.
Note that Ratio
's instances inherit the deficiencies from the type
parameter's. For example, Ratio Natural
's Num
instance has similar
problems to Natural
's.
!a :% !a |
Instances
Integral a => Enum (Ratio a) # | Since: base-2.0.1 |
Defined in GHC.Real succ :: Ratio a -> Ratio a Source # pred :: Ratio a -> Ratio a Source # toEnum :: Int -> Ratio a Source # fromEnum :: Ratio a -> Int Source # enumFrom :: Ratio a -> [Ratio a] Source # enumFromThen :: Ratio a -> Ratio a -> [Ratio a] Source # enumFromTo :: Ratio a -> Ratio a -> [Ratio a] Source # enumFromThenTo :: Ratio a -> Ratio a -> Ratio a -> [Ratio a] Source # | |
Eq a => Eq (Ratio a) # | Since: base-2.1 |
Integral a => Fractional (Ratio a) # | Since: base-2.0.1 |
(Data a, Integral a) => Data (Ratio a) # | Since: base-4.0.0.0 |
Defined in Data.Data gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Ratio a -> c (Ratio a) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Ratio a) Source # toConstr :: Ratio a -> Constr Source # dataTypeOf :: Ratio a -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Ratio a)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Ratio a)) Source # gmapT :: (forall b. Data b => b -> b) -> Ratio a -> Ratio a Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Ratio a -> r Source # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Ratio a -> r Source # gmapQ :: (forall d. Data d => d -> u) -> Ratio a -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> Ratio a -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Ratio a -> m (Ratio a) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Ratio a -> m (Ratio a) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Ratio a -> m (Ratio a) Source # | |
Integral a => Num (Ratio a) # | Since: base-2.0.1 |
Defined in GHC.Real | |
Integral a => Ord (Ratio a) # | Since: base-2.0.1 |
(Integral a, Read a) => Read (Ratio a) # | Since: base-2.1 |
Integral a => Real (Ratio a) # | Since: base-2.0.1 |
Integral a => RealFrac (Ratio a) # | Since: base-2.0.1 |
Show a => Show (Ratio a) # | Since: base-2.0.1 |
(Storable a, Integral a) => Storable (Ratio a) # | Since: base-4.8.0.0 |
Defined in Foreign.Storable sizeOf :: Ratio a -> Int Source # alignment :: Ratio a -> Int Source # peekElemOff :: Ptr (Ratio a) -> Int -> IO (Ratio a) Source # pokeElemOff :: Ptr (Ratio a) -> Int -> Ratio a -> IO () Source # peekByteOff :: Ptr b -> Int -> IO (Ratio a) Source # pokeByteOff :: Ptr b -> Int -> Ratio a -> IO () Source # |
ratioPrec1 :: Int Source #
numerator :: Ratio a -> a Source #
Extract the numerator of the ratio in reduced form: the numerator and denominator have no common factor and the denominator is positive.
denominator :: Ratio a -> a Source #
Extract the denominator of the ratio in reduced form: the numerator and denominator have no common factor and the denominator is positive.
reduce :: Integral a => a -> a -> Ratio a Source #
reduce
is a subsidiary function used only in this module.
It normalises a ratio by dividing both numerator and denominator by
their greatest common divisor.
class (Num a, Ord a) => Real a where Source #
toRational :: a -> Rational Source #
the rational equivalent of its real argument with full precision
Instances
class (Real a, Enum a) => Integral a where Source #
Integral numbers, supporting integer division.
The Haskell Report defines no laws for Integral
. However, Integral
instances are customarily expected to define a Euclidean domain and have the
following properties for the div
/mod
and quot
/rem
pairs, given
suitable Euclidean functions f
and g
:
x
=y * quot x y + rem x y
withrem x y
=fromInteger 0
org (rem x y)
<g y
x
=y * div x y + mod x y
withmod x y
=fromInteger 0
orf (mod x y)
<f y
An example of a suitable Euclidean function, for Integer
's instance, is
abs
.
quot :: a -> a -> a infixl 7 Source #
integer division truncated toward zero
rem :: a -> a -> a infixl 7 Source #
integer remainder, satisfying
(x `quot` y)*y + (x `rem` y) == x
div :: a -> a -> a infixl 7 Source #
integer division truncated toward negative infinity
mod :: a -> a -> a infixl 7 Source #
integer modulus, satisfying
(x `div` y)*y + (x `mod` y) == x
quotRem :: a -> a -> (a, a) Source #
divMod :: a -> a -> (a, a) Source #
toInteger :: a -> Integer Source #
conversion to Integer
Instances
class Num a => Fractional a where Source #
Fractional numbers, supporting real division.
The Haskell Report defines no laws for Fractional
. However, (
and
+
)(
are customarily expected to define a division ring and have the
following properties:*
)
recip
gives the multiplicative inversex * recip x
=recip x * x
=fromInteger 1
Note that it isn't customarily expected that a type instance of
Fractional
implement a field. However, all instances in base
do.
fromRational, (recip | (/))
(/) :: a -> a -> a infixl 7 Source #
Fractional division.
Reciprocal fraction.
fromRational :: Rational -> a Source #
Conversion from a Rational
(that is
).
A floating literal stands for an application of Ratio
Integer
fromRational
to a value of type Rational
, so such literals have type
(
.Fractional
a) => a
Instances
Fractional Double # | Note that due to the presence of
Since: base-2.1 |
Fractional Float # | Note that due to the presence of
Since: base-2.1 |
Fractional CDouble # | |
Fractional CFloat # | |
Integral a => Fractional (Ratio a) # | Since: base-2.0.1 |
Fractional a => Fractional (Identity a) # | Since: base-4.9.0.0 |
HasResolution a => Fractional (Fixed a) # | Since: base-2.1 |
RealFloat a => Fractional (Complex a) # | Since: base-2.1 |
Fractional a => Fractional (Op a b) # | |
Fractional a => Fractional (Const a b) # | Since: base-4.9.0.0 |
class (Real a, Fractional a) => RealFrac a where Source #
Extracting components of fractions.
properFraction :: Integral b => a -> (b, a) Source #
The function properFraction
takes a real fractional number x
and returns a pair (n,f)
such that x = n+f
, and:
n
is an integral number with the same sign asx
; andf
is a fraction with the same type and sign asx
, and with absolute value less than1
.
The default definitions of the ceiling
, floor
, truncate
and round
functions are in terms of properFraction
.
truncate :: Integral b => a -> b Source #
returns the integer nearest truncate
xx
between zero and x
round :: Integral b => a -> b Source #
returns the nearest integer to round
xx
;
the even integer if x
is equidistant between two integers
ceiling :: Integral b => a -> b Source #
returns the least integer not less than ceiling
xx
floor :: Integral b => a -> b Source #
returns the greatest integer not greater than floor
xx
Instances
RealFrac Double # | Since: base-2.1 |
RealFrac Float # | Since: base-2.1 |
RealFrac CDouble # | |
RealFrac CFloat # | |
Integral a => RealFrac (Ratio a) # | Since: base-2.0.1 |
RealFrac a => RealFrac (Identity a) # | Since: base-4.9.0.0 |
HasResolution a => RealFrac (Fixed a) # | Since: base-2.1 |
RealFrac a => RealFrac (Const a b) # | Since: base-4.9.0.0 |
numericEnumFrom :: Fractional a => a -> [a] Source #
numericEnumFromThen :: Fractional a => a -> a -> [a] Source #
numericEnumFromTo :: (Ord a, Fractional a) => a -> a -> [a] Source #
numericEnumFromThenTo :: (Ord a, Fractional a) => a -> a -> a -> [a] Source #
fromIntegral :: (Integral a, Num b) => a -> b Source #
general coercion from integral types
realToFrac :: (Real a, Fractional b) => a -> b Source #
general coercion to fractional types
:: Real a | |
=> (a -> ShowS) | a function that can show unsigned values |
-> Int | the precedence of the enclosing context |
-> a | the value to show |
-> ShowS |
Converts a possibly-negative Real
value to a string.
(^) :: (Num a, Integral b) => a -> b -> a infixr 8 Source #
raise a number to a non-negative integral power
(^^) :: (Fractional a, Integral b) => a -> b -> a infixr 8 Source #
raise a number to an integral power
gcd :: Integral a => a -> a -> a Source #
is the non-negative factor of both gcd
x yx
and y
of which
every common factor of x
and y
is also a factor; for example
, gcd
4 2 = 2
, gcd
(-4) 6 = 2
= gcd
0 44
.
= gcd
0 00
.
(That is, the common divisor that is "greatest" in the divisibility
preordering.)
Note: Since for signed fixed-width integer types,
,
the result may be negative if one of the arguments is abs
minBound
< 0
(and
necessarily is if the other is minBound
0
or
) for such types.minBound
lcm :: Integral a => a -> a -> a Source #
is the smallest positive integer that both lcm
x yx
and y
divide.
integralEnumFrom :: (Integral a, Bounded a) => a -> [a] Source #
integralEnumFromThen :: (Integral a, Bounded a) => a -> a -> [a] Source #
integralEnumFromTo :: Integral a => a -> a -> [a] Source #
integralEnumFromThenTo :: Integral a => a -> a -> a -> [a] Source #