math

package
v4.2.4 Latest Latest
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 Go to latest Published: Sep 25, 2024 License: Apache-2.0 Imports: 8 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// number of decimal places
	Precision = 27

	// bits required to represent the above precision
	// Ceiling[Log2[10^Precision - 1]]
	PrecDecimalPrecisionBits = 90

	MaxBitLen = 256
)

Variables

View Source 
var (
	ErrEmptyPrecDecimalStr      = errors.New("decimal string cannot be empty")
	ErrInvalidPrecDecimalLength = errors.New("invalid decimal length")
	ErrInvalidPrecDecimalStr    = errors.New("invalid decimal string")
)

PrecDecimal errors

Functions

func FormatPrecDec 

func FormatPrecDec(v string) (string, error)

FormatPrecDec formats a decimal (as encoded in protobuf) into a value-rendered string following ADR-050. This function operates with string manipulation (instead of manipulating the sdk.PrecDec object).

func PrecDecApproxEq 

func PrecDecApproxEq(t *testing.T, d1, d2, tol PrecDec) (*testing.T, bool, string, string, string)

func PrecDecEq 

func PrecDecEq(t *testing.T, exp, got PrecDec) (*testing.T, bool, string, string, string)

intended to be used with require/assert: require.True(PrecDecEq(...))

func PrecDecsEqual 

func PrecDecsEqual(d1s, d2s []PrecDec) bool

test if two decimal arrays are equal

func SortablePrecDecBytes 

func SortablePrecDecBytes(dec PrecDec) []byte

SortablePrecDecBytes returns a byte slice representation of a PrecDec that can be sorted. Left and right pads with 0s so there are 18 digits to left and right of the decimal point. For this reason, there is a maximum and minimum value for this, enforced by ValidSortablePrecDec.

func ValidSortablePrecDec 

func ValidSortablePrecDec(dec PrecDec) bool

ValidSortablePrecDec ensures that a PrecDec is within the sortable bounds, a PrecDec can't have a precision of less than 10^-18. Max sortable decimal was set to the reciprocal of SmallestPrecDec.

Types

type PrecDec 

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

NOTE: never use new(Dec) or else we will panic unmarshalling into the nil embedded big.Int 

var MaxSortablePrecDec PrecDec

MaxSortablePrecDec is the largest PrecDec that can be passed into SortablePrecDecBytes() Its negative form is the least PrecDec that can be passed in.

func MaxPrecDec 

func MaxPrecDec(d1, d2 PrecDec) PrecDec

maximum decimal between two

func MinPrecDec 

func MinPrecDec(d1, d2 PrecDec) PrecDec

minimum decimal between two

func MustNewPrecDecFromStr 

func MustNewPrecDecFromStr(s string) PrecDec

PrecDecimal from string, panic on error

func NewPrecDec 

func NewPrecDec(i int64) PrecDec

create a new PrecDec from integer assuming whole number

func NewPrecDecFromBigInt 

func NewPrecDecFromBigInt(i *big.Int) PrecDec

create a new PrecDec from big integer assuming whole numbers CONTRACT: prec <= Precision

func NewPrecDecFromBigIntWithPrec 

func NewPrecDecFromBigIntWithPrec(i *big.Int, prec int64) PrecDec

create a new PrecDec from big integer assuming whole numbers CONTRACT: prec <= Precision

func NewPrecDecFromInt 

func NewPrecDecFromInt(i math.Int) PrecDec

create a new PrecDec from big integer assuming whole numbers CONTRACT: prec <= Precision

func NewPrecDecFromIntWithPrec 

func NewPrecDecFromIntWithPrec(i math.Int, prec int64) PrecDec

create a new PrecDec from big integer with decimal place at prec CONTRACT: prec <= Precision

func NewPrecDecFromStr 

func NewPrecDecFromStr(str string) (PrecDec, error)

create a decimal from an input decimal string. valid must come in the form: 

(-) whole integers (.) decimal integers

examples of acceptable input include: 

-123.456
456.7890
345
-456789

NOTE - An error will return if more decimal places are provided in the string than the constant Precision.

CONTRACT - This function does not mutate the input str.

func NewPrecDecWithPrec 

func NewPrecDecWithPrec(i, prec int64) PrecDec

create a new PrecDec from integer with decimal place at prec CONTRACT: prec <= Precision

func OnePrecDec 

func OnePrecDec() PrecDec

func SmallestPrecDec 

func SmallestPrecDec() PrecDec

func ZeroPrecDec 

func ZeroPrecDec() PrecDec

func (PrecDec) Abs 

func (d PrecDec) Abs() PrecDec

func (PrecDec) AbsMut 

func (d PrecDec) AbsMut() PrecDec

func (PrecDec) Add 

func (d PrecDec) Add(d2 PrecDec) PrecDec

addition

func (PrecDec) AddMut 

func (d PrecDec) AddMut(d2 PrecDec) PrecDec

mutable addition

func (PrecDec) ApproxRoot 

func (d PrecDec) ApproxRoot(root uint64) (guess PrecDec, err error)

ApproxRoot returns an approximate estimation of a PrecDec's positive real nth root using Newton's method (where n is positive). The algorithm starts with some guess and computes the sequence of improved guesses until an answer converges to an approximate answer. It returns `|d|.ApproxRoot() * -1` if input is negative. A maximum number of 100 iterations is used a backup boundary condition for cases where the answer never converges enough to satisfy the main condition.

func (PrecDec) ApproxSqrt 

func (d PrecDec) ApproxSqrt() (PrecDec, error)

ApproxSqrt is a wrapper around ApproxRoot for the common special case of finding the square root of a number. It returns -(sqrt(abs(d)) if input is negative.

func (PrecDec) BigInt 

func (d PrecDec) BigInt() *big.Int

BigInt returns a copy of the underlying big.Int.

func (PrecDec) Ceil 

func (d PrecDec) Ceil() PrecDec

Ceil returns the smallest interger value (as a decimal) that is greater than or equal to the given decimal.

func (PrecDec) Clone 

func (d PrecDec) Clone() PrecDec

func (PrecDec) Equal 

func (d PrecDec) Equal(d2 PrecDec) bool

func (PrecDec) Float64 

func (d PrecDec) Float64() (float64, error)

Float64 returns the float64 representation of a PrecDec. Will return the error if the conversion failed.

func (PrecDec) Format 

func (d PrecDec) Format(s fmt.State)

Format decimal state

func (PrecDec) GT 

func (d PrecDec) GT(d2 PrecDec) bool

func (PrecDec) GTE 

func (d PrecDec) GTE(d2 PrecDec) bool

func (PrecDec) ImmutOp 

func (d PrecDec) ImmutOp(op func(PrecDec, PrecDec) PrecDec, d2 PrecDec) PrecDec

func (PrecDec) ImmutOpInt 

func (d PrecDec) ImmutOpInt(op func(PrecDec, math.Int) PrecDec, d2 math.Int) PrecDec

func (PrecDec) ImmutOpInt64 

func (d PrecDec) ImmutOpInt64(op func(PrecDec, int64) PrecDec, d2 int64) PrecDec

func (PrecDec) IsInteger 

func (d PrecDec) IsInteger() bool

is integer, e.g. decimals are zero

func (PrecDec) IsNegative 

func (d PrecDec) IsNegative() bool

func (PrecDec) IsNil 

func (d PrecDec) IsNil() bool

func (PrecDec) IsPositive 

func (d PrecDec) IsPositive() bool

func (PrecDec) IsZero 

func (d PrecDec) IsZero() bool

func (PrecDec) LT 

func (d PrecDec) LT(d2 PrecDec) bool

func (PrecDec) LTE 

func (d PrecDec) LTE(d2 PrecDec) bool

func (PrecDec) Marshal 

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

Marshal implements the gogo proto custom type interface.

func (PrecDec) MarshalAmino 

func (d PrecDec) MarshalAmino() ([]byte, error)

Override Amino binary serialization by proxying to protobuf.

func (PrecDec) MarshalJSON 

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

MarshalJSON marshals the decimal

func (*PrecDec) MarshalTo 

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

MarshalTo implements the gogo proto custom type interface.

func (PrecDec) MarshalYAML 

func (d PrecDec) MarshalYAML() (interface{}, error)

MarshalYAML returns the YAML representation.

func (PrecDec) Mul 

func (d PrecDec) Mul(d2 PrecDec) PrecDec

multiplication

func (PrecDec) MulInt 

func (d PrecDec) MulInt(i math.Int) PrecDec

multiplication

func (PrecDec) MulInt64 

func (d PrecDec) MulInt64(i int64) PrecDec

MulInt64 - multiplication with int64

func (PrecDec) MulInt64Mut 

func (d PrecDec) MulInt64Mut(i int64) PrecDec

func (PrecDec) MulIntMut 

func (d PrecDec) MulIntMut(i math.Int) PrecDec

func (PrecDec) MulMut 

func (d PrecDec) MulMut(d2 PrecDec) PrecDec

mutable multiplication

func (PrecDec) MulTruncate 

func (d PrecDec) MulTruncate(d2 PrecDec) PrecDec

multiplication truncate

func (PrecDec) MulTruncateMut 

func (d PrecDec) MulTruncateMut(d2 PrecDec) PrecDec

mutable multiplication truncage

func (PrecDec) MustFloat64 

func (d PrecDec) MustFloat64() float64

MustFloat64 returns the float64 representation of a PrecDec. Would panic if the conversion failed.

func (PrecDec) Neg 

func (d PrecDec) Neg() PrecDec

func (PrecDec) NegMut 

func (d PrecDec) NegMut() PrecDec

func (PrecDec) Power 

func (d PrecDec) Power(power uint64) PrecDec

Power returns a the result of raising to a positive integer power

func (PrecDec) PowerMut 

func (d PrecDec) PowerMut(power uint64) PrecDec

func (PrecDec) Quo 

func (d PrecDec) Quo(d2 PrecDec) PrecDec

quotient

func (PrecDec) QuoInt 

func (d PrecDec) QuoInt(i math.Int) PrecDec

quotient

func (PrecDec) QuoInt64 

func (d PrecDec) QuoInt64(i int64) PrecDec

QuoInt64 - quotient with int64

func (PrecDec) QuoInt64Mut 

func (d PrecDec) QuoInt64Mut(i int64) PrecDec

func (PrecDec) QuoIntMut 

func (d PrecDec) QuoIntMut(i math.Int) PrecDec

func (PrecDec) QuoMut 

func (d PrecDec) QuoMut(d2 PrecDec) PrecDec

mutable quotient

func (PrecDec) QuoRoundUp 

func (d PrecDec) QuoRoundUp(d2 PrecDec) PrecDec

quotient, round up

func (PrecDec) QuoRoundupMut 

func (d PrecDec) QuoRoundupMut(d2 PrecDec) PrecDec

mutable quotient, round up

func (PrecDec) QuoTruncate 

func (d PrecDec) QuoTruncate(d2 PrecDec) PrecDec

quotient truncate

func (PrecDec) QuoTruncateMut 

func (d PrecDec) QuoTruncateMut(d2 PrecDec) PrecDec

mutable quotient truncate

func (PrecDec) RoundInt 

func (d PrecDec) RoundInt() math.Int

RoundInt round the decimal using bankers rounding

func (PrecDec) RoundInt64 

func (d PrecDec) RoundInt64() int64

RoundInt64 rounds the decimal using bankers rounding

func (PrecDec) Set 

func (d PrecDec) Set(d2 PrecDec) PrecDec

func (PrecDec) SetInt64 

func (d PrecDec) SetInt64(i int64) PrecDec

func (*PrecDec) Size 

func (d *PrecDec) Size() int

Size implements the gogo proto custom type interface.

func (PrecDec) String 

func (d PrecDec) String() string

func (PrecDec) Sub 

func (d PrecDec) Sub(d2 PrecDec) PrecDec

subtraction

func (PrecDec) SubMut 

func (d PrecDec) SubMut(d2 PrecDec) PrecDec

mutable subtraction

func (PrecDec) TruncateInt 

func (d PrecDec) TruncateInt() math.Int

TruncateInt truncates the decimals from the number and returns an Int

func (PrecDec) TruncateInt64 

func (d PrecDec) TruncateInt64() int64

TruncateInt64 truncates the decimals from the number and returns an int64

func (PrecDec) TruncatePrecDec 

func (d PrecDec) TruncatePrecDec() PrecDec

TruncatePrecDec truncates the decimals from the number and returns a PrecDec

func (*PrecDec) Unmarshal 

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

Unmarshal implements the gogo proto custom type interface.

func (*PrecDec) UnmarshalAmino 

func (d *PrecDec) UnmarshalAmino(bz []byte) error

func (*PrecDec) UnmarshalJSON 

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

UnmarshalJSON defines custom decoding scheme

Source Files

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