bigfloat

README

Package bigfloat provides arbitrary-precision natural logarithm and exponentiation for the standard library's big.Float type.

The package requires Go 1.10 or newer.

Example

package main

import (
	"fmt"
	"math/big"

	"github.com/ALTree/bigfloat"
)

// We'll compute the value of the transcendental number 2^√2, also
// known as the Gelfond–Schneider constant, to 1000 bits.
func main() {
	const prec = 1000 // in binary digits
	two := big.NewFloat(2).SetPrec(prec)
	sqrtTwo := new(big.Float).SetPrec(prec).Sqrt(two)

	// Pow uses the first argument's precision.
	gsc := bigfloat.Pow(two, sqrtTwo) // 2^√2
	fmt.Printf("gsc = %.60f\n", gsc)
}

outputs:

gsc = 2.665144142690225188650297249873139848274211313714659492835980

Documentation

See https://godoc.org/github.com/ALTree/bigfloat

Documentation

Index

• func Exp(z *big.Float) *big.Float
• func Log(z *big.Float) *big.Float
• func Pow(z *big.Float, w *big.Float) *big.Float

Functions

func Exp

func Exp(z *big.Float) *big.Float

Exp returns a big.Float representation of exp(z). Precision is the same as the one of the argument. The function returns +Inf when z = +Inf, and 0 when z = -Inf.

func Log

func Log(z *big.Float) *big.Float

Log returns a big.Float representation of the natural logarithm of z. Precision is the same as the one of the argument. The function panics if z is negative, returns -Inf when z = 0, and +Inf when z = +Inf

func Pow

func Pow(z *big.Float, w *big.Float) *big.Float

Pow returns a big.Float representation of z**w. Precision is the same as the one of the first argument. The function panics when z is negative.