mathext

package
v0.1.14 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Dec 6, 2021 License: BSD-3-Clause Imports: 3 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	Int8    = new(I8)
	Int16   = new(I16)
	Int32   = new(I32)
	Int64   = new(I64)
	Int     = new(INT)
	UInt8   = new(U8)
	UInt16  = new(U16)
	UInt32  = new(U32)
	UInt64  = new(U64)
	UInt    = new(UINT)
	Float32 = new(F32)
	Float64 = new(F64)
)

Functions

func F32to64 

func F32to64(f uint32) uint64

func F32toint32 

func F32toint32(x uint32) int32

func F32toint64 

func F32toint64(x uint32) int64

func F32touint64 

func F32touint64(x float32) uint64

func F64to32 

func F64to32(f uint64) uint32

func F64toInt 

func F64toInt(f uint64) (val int64, ok bool)

func F64toint32 

func F64toint32(x uint64) int32

func F64toint64 

func F64toint64(x uint64) int64

func F64touint64 

func F64touint64(x float64) uint64

func Fadd32 

func Fadd32(x, y uint32) uint32

func Fadd64 

func Fadd64(f, g uint64) uint64

func Fcmp64 

func Fcmp64(f, g uint64) (cmp int32, isnan bool)

func Fdiv32 

func Fdiv32(x, y uint32) uint32

func Fdiv64 

func Fdiv64(f, g uint64) uint64

func Feq32 

func Feq32(x, y uint32) bool

func Feq64 

func Feq64(x, y uint64) bool

func Fge32 

func Fge32(x, y uint32) bool

func Fge64 

func Fge64(x, y uint64) bool

func Fgt32 

func Fgt32(x, y uint32) bool

func Fgt64 

func Fgt64(x, y uint64) bool

func Fint32to32 

func Fint32to32(x int32) uint32

func Fint32to64 

func Fint32to64(x int32) uint64

func Fint64to32 

func Fint64to32(x int64) uint32

func Fint64to64 

func Fint64to64(x int64) uint64

func Fintto64 

func Fintto64(val int64) (f uint64)

func Fmul32 

func Fmul32(x, y uint32) uint32

func Fmul64 

func Fmul64(f, g uint64) uint64

func Fneg64 

func Fneg64(f uint64) uint64

func Fpack32 

func Fpack32(sign, mant uint32, exp int, trunc uint32) uint32

func Fpack64 

func Fpack64(sign, mant uint64, exp int, trunc uint64) uint64

func Fsub64 

func Fsub64(f, g uint64) uint64

func Fuint64to32 

func Fuint64to32(x uint64) float32

func Fuint64to64 

func Fuint64to64(x uint64) float64

func Funpack32 

func Funpack32(f uint32) (sign, mant uint32, exp int, inf, nan bool)

func Funpack64 

func Funpack64(f uint64) (sign, mant uint64, exp int, inf, nan bool)

func IsAlmostEqualFloat32 

func IsAlmostEqualFloat32(a, b float32) bool

func IsAlmostEqualFloat64 

func IsAlmostEqualFloat64(a, b float64) bool

Returns true if this number is at most kMaxUlps ULP's away from rhs. In particular, this function:

  • returns false if either number is (or both are) NAN.
  • treats really large numbers as almost equal to infinity.
  • thinks +0.0 and -0.0 are 0 DLP's apart.

func RandFloat 

func RandFloat(min, max float64) float64

Random number in [min, max]

func RandInt 

func RandInt(min, max int) int

Random integer in [min, max]

func RangePerm 

func RangePerm(min, max int) []int

集合内随机取数, [min,max]

func RoundFloat 

func RoundFloat(x float64) float64

https://github.com/montanaflynn/stats/blob/master/round.go

func RoundHalf 

func RoundHalf(v float64) int

四舍五入

func SignAndMagnitudeToBiasedFloat32 

func SignAndMagnitudeToBiasedFloat32(sam uint32) uint32

func SignAndMagnitudeToBiasedFloat64 

func SignAndMagnitudeToBiasedFloat64(sam uint64) uint64

Converts an integer from the sign-and-magnitude representation to the biased representation. More precisely, let N be 2 to the power of (kBitCount - 1), an integer x is represented by the unsigned number x + N.

For instance, 

-N + 1 (the most negative number representable using
       sign-and-magnitude) is represented by 1;
0      is represented by N; and
N - 1  (the biggest number representable using
       sign-and-magnitude) is represented by 2N - 1.

Read http://en.wikipedia.org/wiki/Signed_number_representations for more details on signed number representations.

Types

type F32 

type F32 float32

func (F32) Abs 

func (F32) Abs(x float32) float32

func (F32) Dim 

func (a F32) Dim(x, y float32) float32

func (F32) Max 

func (F32) Max(x, y float32) float32

func (F32) Min 

func (F32) Min(x, y float32) float32

func (F32) SafeDiv 

func (a F32) SafeDiv(x, y float32) float32

type F64 

type F64 float64

func (F64) Abs 

func (F64) Abs(x float64) float64

func (F64) Dim 

func (a F64) Dim(x, y float64) float64

func (F64) Max 

func (F64) Max(x, y float64) float64

func (F64) Min 

func (F64) Min(x, y float64) float64

func (F64) SafeDiv 

func (a F64) SafeDiv(x, y float64) float64

type I16 

type I16 int16

func (I16) Abs 

func (I16) Abs(x int16) int16

func (I16) Dim 

func (a I16) Dim(x, y int16) int16

func (I16) Max 

func (I16) Max(x, y int16) int16

func (I16) Min 

func (I16) Min(x, y int16) int16

type I32 

type I32 int32

func (I32) Abs 

func (I32) Abs(x int32) int32

func (I32) Dim 

func (a I32) Dim(x, y int32) int32

func (I32) Max 

func (I32) Max(x, y int32) int32

func (I32) Min 

func (I32) Min(x, y int32) int32

type I64 

type I64 int64

func (I64) Abs 

func (I64) Abs(x int64) int64

func (I64) Dim 

func (a I64) Dim(x, y int64) int64

func (I64) Max 

func (I64) Max(x, y int64) int64

func (I64) Min 

func (I64) Min(x, y int64) int64

type I8 

type I8 int8

func (I8) Abs 

func (I8) Abs(x int8) int8

func (I8) Dim 

func (a I8) Dim(x, y int8) int8

func (I8) Max 

func (I8) Max(x, y int8) int8

func (I8) Min 

func (I8) Min(x, y int8) int8

type INT 

type INT int

func (INT) Abs 

func (INT) Abs(x int) int

func (INT) Dim 

func (a INT) Dim(x, y int) int

func (INT) Max 

func (INT) Max(x, y int) int

func (INT) Min 

func (INT) Min(x, y int) int

type LCG 

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

线性同余法的随机数生成器 see https://en.wikipedia.org/wiki/Linear_congruential_generator

func (*LCG) Rand 

func (g *LCG) Rand() uint32

func (*LCG) Seed 

func (g *LCG) Seed(seed uint32)

type U16 

type U16 uint16

func (U16) Abs 

func (U16) Abs(x uint16) uint16

func (U16) Dim 

func (a U16) Dim(x, y uint16) uint16

func (U16) Max 

func (U16) Max(x, y uint16) uint16

func (U16) Min 

func (U16) Min(x, y uint16) uint16

type U32 

type U32 uint32

func (U32) Abs 

func (U32) Abs(x uint32) uint32

func (U32) Dim 

func (a U32) Dim(x, y uint32) uint32

func (U32) Max 

func (U32) Max(x, y uint32) uint32

func (U32) Min 

func (U32) Min(x, y uint32) uint32

type U64 

type U64 uint64

func (U64) Abs 

func (U64) Abs(x uint64) uint64

func (U64) Dim 

func (a U64) Dim(x, y uint64) uint64

func (U64) Max 

func (U64) Max(x, y uint64) uint64

func (U64) Min 

func (U64) Min(x, y uint64) uint64

type U8 

type U8 uint8

func (U8) Abs 

func (U8) Abs(x uint8) uint8

func (U8) Dim 

func (a U8) Dim(x, y uint8) uint8

func (U8) Max 

func (U8) Max(x, y uint8) uint8

func (U8) Min 

func (U8) Min(x, y uint8) uint8

type UINT 

type UINT uint

func (UINT) Abs 

func (UINT) Abs(x uint) uint

func (UINT) Dim 

func (a UINT) Dim(x, y uint) uint

func (UINT) Max 

func (UINT) Max(x, y uint) uint

func (UINT) Min 

func (UINT) Min(x, y uint) uint

Source Files

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