math

package
v0.2.10 Latest Latest
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 Go to latest Published: Jun 26, 2024 License: Apache-2.0 Imports: 9 Imported by: 6

Documentation

Index

Constants

View Source 
const (
	GreaterThan = 1
	LessThan    = -1
	EqualTo     = 0
)

constants for more convenient intent behind dec.Cmp values.

Variables

View Source 
var (
	ErrInvalidDecString   = errors.Register(mathCodespace, 1, "invalid decimal string")
	ErrUnexpectedRounding = errors.Register(mathCodespace, 2, "unexpected rounding")
	ErrNonIntegeral       = errors.Register(mathCodespace, 3, "value is non-integral")
	ErrInfiniteString     = errors.Register(mathCodespace, 4, "value is infinite")
)
View Source 
var DecValue collcodec.ValueCodec[Dec] = decValueCodec{}
View Source 
var LegacyDecValue collcodec.ValueCodec[cosmosMath.LegacyDec] = legacyDecValueCodec{}

Functions

func GetSortedElementsByDecWeightDesc 

func GetSortedElementsByDecWeightDesc[K cmp.Ordered](l []K, m map[K]*Dec) []K

Generic function that sorts the keys of a map. Used for deterministic ranging of arrays with weights in a map whose keys may not include some values in the array. When an array element is not in the map, it is not included in the output array.

func GetSortedKeys 

func GetSortedKeys[K cmp.Ordered, V any](m map[K]V) []K

Generic function that sorts the keys of a map Used for deterministic ranging of maps

func InDelta 

func InDelta(expected, result Dec, epsilon Dec) bool

helper function for test suites that want to check if some math is within a delta

func SlicesInDelta 

func SlicesInDelta(a, b []Dec, epsilon Dec) bool

Helper function to compare two slices of alloraMath.Dec within a delta

Types

type Dec 

type Dec struct {
	// contains filtered or unexported fields
}

Dec is a wrapper struct around apd.Decimal that does no mutation of apd.Decimal's when performing arithmetic, instead creating a new apd.Decimal for every operation ensuring usage is safe.

Using apd.Decimal directly can be unsafe because apd operations mutate the underlying Decimal, but when copying the big.Int structure can be shared between Decimal instances causing corruption. This was originally discovered in regen0-network/mainnet#15.

func CalcEma 

func CalcEma(
	alpha,
	current,
	previous Dec,
	firstTime bool,
) (Dec, error)

all exponential moving average functions take the form x_average=α*x_current + (1-α)*x_previous

this covers the equations Uij = αUij + (1 − α)Ui−1,j ̃Vik = αVik + (1 − α)Vi−1,k ̃Wim = αWim + (1 − α)Wi−1,m

func CalcExpDecay added in v0.2.6 

func CalcExpDecay(
	currentRev,
	decayFactor Dec,
) (Dec, error)

func Exp 

func Exp(x Dec) (Dec, error)

Exp returns a new Dec with the value of e^x, without mutating x.

func Exp10 

func Exp10(x Dec) (Dec, error)

Exp10 returns a new Dec with the value of 10^x, without mutating x.

func Gradient 

func Gradient(p, c, x Dec) (Dec, error)

Implements the new gradient function phi prime φ'_p(x) = p / (exp(p * (c - x)) + 1)

func Ln 

func Ln(x Dec) (Dec, error)

Ln returns a new Dec with the value of the natural logarithm of x, without mutating x.

func Log10 

func Log10(x Dec) (Dec, error)

Log10 returns a new Dec with the value of the base 10 logarithm of x, without mutating x.

func Max 

func Max(x Dec, y Dec) Dec

returns the max of x and y without mutating x or y.

func Median 

func Median(data []Dec) (Dec, error)

Median calculates the median of a slice of `Dec`

func Min 

func Min(x Dec, y Dec) Dec

returns the min of x and y without mutating x or y.

func MustNewDecFromString 

func MustNewDecFromString(s string) Dec

MustNewDecFromString returns a new Dec from a given string. It panics if the string cannot be parsed. The string should be in the format of `123.456`.

func NewDecFinite 

func NewDecFinite(coeff int64, exp int32) Dec

NewDecFinite returns a decimal with a value of coeff * 10^exp.

func NewDecFromInt64 

func NewDecFromInt64(x int64) Dec

create a new dec from an int64 value

func NewDecFromSdkInt 

func NewDecFromSdkInt(x sdkmath.Int) (Dec, error)

NewDec takes a cosmos `sdkmath.Int` and turns it into a Dec it converts via strings and throws an error if the string is unable to be parsed

func NewDecFromSdkLegacyDec 

func NewDecFromSdkLegacyDec(x sdkmath.LegacyDec) (Dec, error)

NewDec takes a cosmos `sdkmath.LegacyDec` and turns it into a Dec it converts via strings and throws an error if the string is unable to be parsed

func NewDecFromString 

func NewDecFromString(s string) (Dec, error)

NewDecFromString returns a new Dec from a given string. It returns an error if the string cannot be parsed. The string should be in the format of `123.456`.

func NewDecFromUint64 

func NewDecFromUint64(x uint64) (Dec, error)

create a new dec from a uint64 value it converts via strings and throws an error if the string is unable to be parsed

func NewNaN 

func NewNaN() Dec

create a new Dec that represents NaN

func NewNonNegativeDecFromString 

func NewNonNegativeDecFromString(s string) (Dec, error)

NewNonNegativeDecFromString returns a new Dec from a given string. It returns an error if the string cannot be parsed or if the decimal is negative. The string should be in the format of `123.456`.

func NewNonNegativeFixedDecFromString 

func NewNonNegativeFixedDecFromString(s string, max uint32) (Dec, error)

NewNonNegativeFixedDecFromString returns a new Dec from a given string and an upper limit on the number of decimal places. It returns an error if the string cannot be parsed, if the decimal is negative, or if the number of decimal places exceeds the maximum. The string should be in the format of `123.456`.

func NewPositiveDecFromString 

func NewPositiveDecFromString(s string) (Dec, error)

NewPositiveDecFromString returns a new Dec from a string, returning an error if the string cannot be parsed or if the decimal is not positive. The string should be in the format of `123.456`.

func NewPositiveFixedDecFromString 

func NewPositiveFixedDecFromString(s string, max uint32) (Dec, error)

NewPositiveFixedDecFromString takes a string and an upper limit on the number of decimal places, returning a Dec or error if the string cannot be parsed, if the decimal is not positive, or if the number of decimal places exceeds the maximum. The string should be in the format of `123.456`.

func OneDec 

func OneDec() Dec

The number 1 encoded as Dec

func Phi 

func Phi(p, c, x Dec) (Dec, error)

Implements the potential function phi for the module ϕ_p(x) = ln(1 + e^(p * (x - c)))

func Pow 

func Pow(x Dec, y Dec) (Dec, error)

Pow returns a new Dec with the value of x**y, without mutating x or y.

func StdDev 

func StdDev(data []Dec) (Dec, error)

StdDev calculates the standard deviation of a slice of `Dec` stdDev = sqrt((Σ(x - μ))^2/ N) where μ is mean and N is number of elements

func SumDecSlice 

func SumDecSlice(x []Dec) (Dec, error)

Generic Sum function, given an array of values returns its sum

func ZeroDec 

func ZeroDec() Dec

The number 0 encoded as Dec

func (Dec) Abs 

func (x Dec) Abs() Dec

Abs returns a new Dec with the absolute value of x, without mutating x.

func (Dec) Add 

func (x Dec) Add(y Dec) (Dec, error)

Add returns a new Dec with value `x+y` without mutating any argument and error if there is an overflow.

func (Dec) BigInt 

func (x Dec) BigInt() (*big.Int, error)

BigInt converts x to a *big.Int or returns an error if x cannot fit precisely into an *big.Int.

func (Dec) Ceil 

func (x Dec) Ceil() (Dec, error)

Ceil returns a new Dec with the value of x rounded up to the nearest integer, without mutating x.

func (Dec) Cmp 

func (x Dec) Cmp(y Dec) int

Cmp compares x and y and returns: -1 if x < y 0 if x == y +1 if x > y undefined if d or x are NaN

func (Dec) Coeff 

func (x Dec) Coeff() big.Int

func (Dec) Equal 

func (x Dec) Equal(y Dec) bool

func (Dec) Floor 

func (x Dec) Floor() (Dec, error)

Floor returns a new Dec with the value of x rounded down to the nearest integer, without mutating x.

func (Dec) Gt 

func (x Dec) Gt(y Dec) bool

func (Dec) Gte 

func (x Dec) Gte(y Dec) bool

func (Dec) Int64 

func (x Dec) Int64() (int64, error)

Int64 converts x to an int64 or returns an error if x cannot fit precisely into an int64.

func (Dec) IsFinite 

func (x Dec) IsFinite() bool

IsFinite returns true if the decimal is finite.

func (Dec) IsNaN 

func (x Dec) IsNaN() bool

func (Dec) IsNegative 

func (x Dec) IsNegative() bool

IsNegative returns true if the decimal is negative.

func (Dec) IsPositive 

func (x Dec) IsPositive() bool

IsPositive returns true if the decimal is positive.

func (Dec) IsZero 

func (x Dec) IsZero() bool

IsZero returns true if the decimal is zero.

func (Dec) Lt 

func (x Dec) Lt(y Dec) bool

func (Dec) Lte 

func (x Dec) Lte(y Dec) bool

func (Dec) Marshal 

func (d Dec) Marshal() ([]byte, error)

Marshal implements the gogo proto custom type interface.

func (Dec) MarshalJSON 

func (d Dec) MarshalJSON() ([]byte, error)

MarshalJSON marshals the decimal

func (*Dec) MarshalTo 

func (d *Dec) MarshalTo(data []byte) (n int, err error)

MarshalTo implements the gogo proto custom type interface.

func (Dec) Mul 

func (x Dec) Mul(y Dec) (Dec, error)

Mul returns a new Dec with value `x*y` (formatted as decimal128, with 34 digit precision) without mutating any argument and error if there is an overflow.

func (Dec) MulExact 

func (x Dec) MulExact(y Dec) (Dec, error)

MulExact returns a new dec with value x * y. The product must not round or ErrUnexpectedRounding will be returned.

func (Dec) Neg 

func (x Dec) Neg() (Dec, error)

Neg negates the decimal and returns a new Dec with value `-x` without mutating any argument and error if there is an overflow.

func (Dec) NumDecimalPlaces 

func (x Dec) NumDecimalPlaces() uint32

NumDecimalPlaces returns the number of decimal places in x.

func (Dec) Quo 

func (x Dec) Quo(y Dec) (Dec, error)

Quo returns a new Dec with value `x/y` (formatted as decimal128, 34 digit precision) without mutating any argument and error if there is an overflow.

func (Dec) QuoExact 

func (x Dec) QuoExact(y Dec) (Dec, error)

QuoExact is a version of Quo that returns ErrUnexpectedRounding if any rounding occurred.

func (Dec) QuoInteger 

func (x Dec) QuoInteger(y Dec) (Dec, error)

QuoInteger returns a new integral Dec with value `x/y` (formatted as decimal128, with 34 digit precision) without mutating any argument and error if there is an overflow.

func (Dec) Reduce 

func (x Dec) Reduce() (Dec, int)

Reduce returns a copy of x with all trailing zeros removed and the number of trailing zeros removed.

func (Dec) Rem 

func (x Dec) Rem(y Dec) (Dec, error)

Rem returns the integral remainder from `x/y` (formatted as decimal128, with 34 digit precision) without mutating any argument and error if the integer part of x/y cannot fit in 34 digit precision

func (Dec) SdkIntTrim 

func (x Dec) SdkIntTrim() sdkmath.Int

SdkIntTrim rounds decimal number to the integer towards zero and converts it to `sdkmath.Int`. Panics if x is bigger the SDK Int max value

func (Dec) SdkLegacyDec 

func (x Dec) SdkLegacyDec() sdkmath.LegacyDec

func (Dec) Size 

func (d Dec) Size() int

Size returns the size of the marshalled Dec type in bytes

func (Dec) Sqrt 

func (x Dec) Sqrt() (Dec, error)

Sqrt returns a new Dec with the value of the square root of x, without mutating x.

func (Dec) String 

func (x Dec) String() string

func (Dec) Sub 

func (x Dec) Sub(y Dec) (Dec, error)

Sub returns a new Dec with value `x-y` without mutating any argument and error if there is an overflow.

func (Dec) UInt64 

func (x Dec) UInt64() (uint64, error)

Int64 converts x to an int64 or returns an error if x cannot fit precisely into an int64.

func (*Dec) Unmarshal 

func (d *Dec) Unmarshal(data []byte) error

Unmarshal implements the gogo proto custom type interface.

func (*Dec) UnmarshalJSON 

func (d *Dec) UnmarshalJSON(bz []byte) error

UnmarshalJSON defines custom decoding scheme

Source Files

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