Documentation
¶
Overview ¶
Package math provides basic constants and mathematical functions.
This package does not guarantee bit-identical results across architectures.
Index ¶
- Constants
- func Abs(x float64) float64
- func Acos(x float64) float64
- func Acosh(x float64) float64
- func Asin(x float64) float64
- func Asinh(x float64) float64
- func Atan(x float64) float64
- func Atan2(y, x float64) float64
- func Atanh(x float64) float64
- func Cbrt(x float64) float64
- func Ceil(x float64) float64
- func Copysign(f, sign float64) float64
- func Cos(x float64) float64
- func Cosh(x float64) float64
- func Dim(x, y float64) float64
- func Erf(x float64) float64
- func Erfc(x float64) float64
- func Erfcinv(x float64) float64
- func Erfinv(x float64) float64
- func Exp(x float64) float64
- func Exp2(x float64) float64
- func Expm1(x float64) float64
- func FMA(x, y, z float64) float64
- func Float32bits(f float32) uint32
- func Float32frombits(b uint32) float32
- func Float64bits(f float64) uint64
- func Float64frombits(b uint64) float64
- func Floor(x float64) float64
- func Frexp(f float64) (frac float64, exp int)
- func Gamma(x float64) float64
- func Hypot(p, q float64) float64
- func Ilogb(x float64) int
- func Inf(sign int) float64
- func IsInf(f float64, sign int) bool
- func IsNaN(f float64) (is bool)
- func J0(x float64) float64
- func J1(x float64) float64
- func Jn(n int, x float64) float64
- func Ldexp(frac float64, exp int) float64
- func Lgamma(x float64) (lgamma float64, sign int)
- func Log(x float64) float64
- func Log1p(x float64) float64
- func Log2(x float64) float64
- func Log10(x float64) float64
- func Logb(x float64) float64
- func Max(x, y float64) float64
- func Min(x, y float64) float64
- func Mod(x, y float64) float64
- func Modf(f float64) (integer float64, fractional float64)
- func NaN() float64
- func Nextafter(x, y float64) (r float64)
- func Nextafter32(x, y float32) (r float32)
- func Pow(x, y float64) float64
- func Pow10(n int) float64
- func Remainder(x, y float64) float64
- func Round(x float64) float64
- func RoundToEven(x float64) float64
- func Signbit(x float64) bool
- func Sin(x float64) float64
- func Sincos(x float64) (sin, cos float64)
- func Sinh(x float64) float64
- func Sqrt(x float64) float64
- func Tan(x float64) float64
- func Tanh(x float64) float64
- func Trunc(x float64) float64
- func Y0(x float64) float64
- func Y1(x float64) float64
- func Yn(n int, x float64) float64
Examples ¶
Constants ¶
const ( E = 2.71828182845904523536028747135266249775724709369995957496696763 // https://oeis.org/A001113 Pi = 3.14159265358979323846264338327950288419716939937510582097494459 // https://oeis.org/A000796 Phi = 1.61803398874989484820458683436563811772030917980576286213544862 // https://oeis.org/A001622 Sqrt2 = 1.41421356237309504880168872420969807856967187537694807317667974 // https://oeis.org/A002193 SqrtE = 1.64872127070012814684865078781416357165377610071014801157507931 // https://oeis.org/A019774 SqrtPi = 1.77245385090551602729816748334114518279754945612238712821380779 // https://oeis.org/A002161 SqrtPhi = 1.27201964951406896425242246173749149171560804184009624861664038 // https://oeis.org/A139339 Ln2 = 0.693147180559945309417232121458176568075500134360255254120680009 // https://oeis.org/A002162 Log2E = 1 / Ln2 Ln10 = 2.30258509299404568401799145468436420760110148862877297603332790 // https://oeis.org/A002392 Log10E = 1 / Ln10 )
Mathematical constants.
const ( MaxFloat32 = 0x1p127 * (1 + (1 - 0x1p-23)) // 3.40282346638528859811704183484516925440e+38 SmallestNonzeroFloat32 = 0x1p-126 * 0x1p-23 // 1.401298464324817070923729583289916131280e-45 MaxFloat64 = 0x1p1023 * (1 + (1 - 0x1p-52)) // 1.79769313486231570814527423731704356798070e+308 SmallestNonzeroFloat64 = 0x1p-1022 * 0x1p-52 // 4.9406564584124654417656879286822137236505980e-324 )
Floating-point limit values. Max is the largest finite value representable by the type. SmallestNonzero is the smallest positive, non-zero value representable by the type.
const ( MaxInt = 1<<(intSize-1) - 1 // MaxInt32 or MaxInt64 depending on intSize. MinInt = -1 << (intSize - 1) // MinInt32 or MinInt64 depending on intSize. MaxInt8 = 1<<7 - 1 // 127 MinInt8 = -1 << 7 // -128 MaxInt16 = 1<<15 - 1 // 32767 MinInt16 = -1 << 15 // -32768 MaxInt32 = 1<<31 - 1 // 2147483647 MinInt32 = -1 << 31 // -2147483648 MaxInt64 = 1<<63 - 1 // 9223372036854775807 MinInt64 = -1 << 63 // -9223372036854775808 MaxUint = 1<<intSize - 1 // MaxUint32 or MaxUint64 depending on intSize. MaxUint8 = 1<<8 - 1 // 255 MaxUint16 = 1<<16 - 1 // 65535 MaxUint32 = 1<<32 - 1 // 4294967295 MaxUint64 = 1<<64 - 1 // 18446744073709551615 )
Integer limit values.
Variables ¶
This section is empty.
Functions ¶
func Abs ¶
Abs returns the absolute value of x.
Special cases are:
Abs(±Inf) = +Inf Abs(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
x := math.Abs(-2)
fmt.Printf("%.1f\n", x)
y := math.Abs(2)
fmt.Printf("%.1f\n", y)
}
Output: 2.0 2.0
func Acos ¶
Acos returns the arccosine, in radians, of x.
Special case is:
Acos(x) = NaN if x < -1 or x > 1
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Acos(1))
}
Output: 0.00
func Acosh ¶
Acosh returns the inverse hyperbolic cosine of x.
Special cases are:
Acosh(+Inf) = +Inf Acosh(x) = NaN if x < 1 Acosh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Acosh(1))
}
Output: 0.00
func Asin ¶
Asin returns the arcsine, in radians, of x.
Special cases are:
Asin(±0) = ±0 Asin(x) = NaN if x < -1 or x > 1
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Asin(0))
}
Output: 0.00
func Asinh ¶
Asinh returns the inverse hyperbolic sine of x.
Special cases are:
Asinh(±0) = ±0 Asinh(±Inf) = ±Inf Asinh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Asinh(0))
}
Output: 0.00
func Atan ¶
Atan returns the arctangent, in radians, of x.
Special cases are:
Atan(±0) = ±0 Atan(±Inf) = ±Pi/2
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Atan(0))
}
Output: 0.00
func Atan2 ¶
Atan2 returns the arc tangent of y/x, using the signs of the two to determine the quadrant of the return value.
Special cases are (in order):
Atan2(y, NaN) = NaN Atan2(NaN, x) = NaN Atan2(+0, x>=0) = +0 Atan2(-0, x>=0) = -0 Atan2(+0, x<=-0) = +Pi Atan2(-0, x<=-0) = -Pi Atan2(y>0, 0) = +Pi/2 Atan2(y<0, 0) = -Pi/2 Atan2(+Inf, +Inf) = +Pi/4 Atan2(-Inf, +Inf) = -Pi/4 Atan2(+Inf, -Inf) = 3Pi/4 Atan2(-Inf, -Inf) = -3Pi/4 Atan2(y, +Inf) = 0 Atan2(y>0, -Inf) = +Pi Atan2(y<0, -Inf) = -Pi Atan2(+Inf, x) = +Pi/2 Atan2(-Inf, x) = -Pi/2
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Atan2(0, 0))
}
Output: 0.00
func Atanh ¶
Atanh returns the inverse hyperbolic tangent of x.
Special cases are:
Atanh(1) = +Inf Atanh(±0) = ±0 Atanh(-1) = -Inf Atanh(x) = NaN if x < -1 or x > 1 Atanh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Atanh(0))
}
Output: 0.00
func Cbrt ¶
Cbrt returns the cube root of x.
Special cases are:
Cbrt(±0) = ±0 Cbrt(±Inf) = ±Inf Cbrt(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f\n", math.Cbrt(8))
fmt.Printf("%.2f\n", math.Cbrt(27))
}
Output: 2.00 3.00
func Ceil ¶
Ceil returns the least integer value greater than or equal to x.
Special cases are:
Ceil(±0) = ±0 Ceil(±Inf) = ±Inf Ceil(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
c := math.Ceil(1.49)
fmt.Printf("%.1f", c)
}
Output: 2.0
func Copysign ¶
Copysign returns a value with the magnitude of f and the sign of sign.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Copysign(3.2, -1))
}
Output: -3.20
func Cos ¶
Cos returns the cosine of the radian argument x.
Special cases are:
Cos(±Inf) = NaN Cos(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Cos(math.Pi/2))
}
Output: 0.00
func Cosh ¶
Cosh returns the hyperbolic cosine of x.
Special cases are:
Cosh(±0) = 1 Cosh(±Inf) = +Inf Cosh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Cosh(0))
}
Output: 1.00
func Dim ¶
Dim returns the maximum of x-y or 0.
Special cases are:
Dim(+Inf, +Inf) = NaN Dim(-Inf, -Inf) = NaN Dim(x, NaN) = Dim(NaN, x) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f\n", math.Dim(4, -2))
fmt.Printf("%.2f\n", math.Dim(-4, 2))
}
Output: 6.00 0.00
func Erf ¶
Erf returns the error function of x.
Special cases are:
Erf(+Inf) = 1 Erf(-Inf) = -1 Erf(NaN) = NaN
func Erfc ¶
Erfc returns the complementary error function of x.
Special cases are:
Erfc(+Inf) = 0 Erfc(-Inf) = 2 Erfc(NaN) = NaN
func Erfcinv ¶ added in go1.10
Erfcinv returns the inverse of Erfc(x).
Special cases are:
Erfcinv(0) = +Inf Erfcinv(2) = -Inf Erfcinv(x) = NaN if x < 0 or x > 2 Erfcinv(NaN) = NaN
func Erfinv ¶ added in go1.10
Erfinv returns the inverse error function of x.
Special cases are:
Erfinv(1) = +Inf Erfinv(-1) = -Inf Erfinv(x) = NaN if x < -1 or x > 1 Erfinv(NaN) = NaN
func Exp ¶
Exp returns e**x, the base-e exponential of x.
Special cases are:
Exp(+Inf) = +Inf Exp(NaN) = NaN
Very large values overflow to 0 or +Inf. Very small values underflow to 1.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f\n", math.Exp(1))
fmt.Printf("%.2f\n", math.Exp(2))
fmt.Printf("%.2f\n", math.Exp(-1))
}
Output: 2.72 7.39 0.37
func Exp2 ¶
Exp2 returns 2**x, the base-2 exponential of x.
Special cases are the same as Exp.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f\n", math.Exp2(1))
fmt.Printf("%.2f\n", math.Exp2(-3))
}
Output: 2.00 0.12
func Expm1 ¶
Expm1 returns e**x - 1, the base-e exponential of x minus 1. It is more accurate than Exp(x) - 1 when x is near zero.
Special cases are:
Expm1(+Inf) = +Inf Expm1(-Inf) = -1 Expm1(NaN) = NaN
Very large values overflow to -1 or +Inf.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.6f\n", math.Expm1(0.01))
fmt.Printf("%.6f\n", math.Expm1(-1))
}
Output: 0.010050 -0.632121
func FMA ¶ added in go1.14
FMA returns x * y + z, computed with only one rounding. (That is, FMA returns the fused multiply-add of x, y, and z.)
func Float32bits ¶
Float32bits returns the IEEE 754 binary representation of f, with the sign bit of f and the result in the same bit position. Float32bits(Float32frombits(x)) == x.
func Float32frombits ¶
Float32frombits returns the floating-point number corresponding to the IEEE 754 binary representation b, with the sign bit of b and the result in the same bit position. Float32frombits(Float32bits(x)) == x.
func Float64bits ¶
Float64bits returns the IEEE 754 binary representation of f, with the sign bit of f and the result in the same bit position, and Float64bits(Float64frombits(x)) == x.
func Float64frombits ¶
Float64frombits returns the floating-point number corresponding to the IEEE 754 binary representation b, with the sign bit of b and the result in the same bit position. Float64frombits(Float64bits(x)) == x.
func Floor ¶
Floor returns the greatest integer value less than or equal to x.
Special cases are:
Floor(±0) = ±0 Floor(±Inf) = ±Inf Floor(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
c := math.Floor(1.51)
fmt.Printf("%.1f", c)
}
Output: 1.0
func Frexp ¶
Frexp breaks f into a normalized fraction and an integral power of two. It returns frac and exp satisfying f == frac × 2**exp, with the absolute value of frac in the interval [½, 1).
Special cases are:
Frexp(±0) = ±0, 0 Frexp(±Inf) = ±Inf, 0 Frexp(NaN) = NaN, 0
func Gamma ¶
Gamma returns the Gamma function of x.
Special cases are:
Gamma(+Inf) = +Inf Gamma(+0) = +Inf Gamma(-0) = -Inf Gamma(x) = NaN for integer x < 0 Gamma(-Inf) = NaN Gamma(NaN) = NaN
func Hypot ¶
Hypot returns Sqrt(p*p + q*q), taking care to avoid unnecessary overflow and underflow.
Special cases are:
Hypot(±Inf, q) = +Inf Hypot(p, ±Inf) = +Inf Hypot(NaN, q) = NaN Hypot(p, NaN) = NaN
func Ilogb ¶
Ilogb returns the binary exponent of x as an integer.
Special cases are:
Ilogb(±Inf) = MaxInt32 Ilogb(0) = MinInt32 Ilogb(NaN) = MaxInt32
func IsInf ¶
IsInf reports whether f is an infinity, according to sign. If sign > 0, IsInf reports whether f is positive infinity. If sign < 0, IsInf reports whether f is negative infinity. If sign == 0, IsInf reports whether f is either infinity.
func J0 ¶
J0 returns the order-zero Bessel function of the first kind.
Special cases are:
J0(±Inf) = 0 J0(0) = 1 J0(NaN) = NaN
func J1 ¶
J1 returns the order-one Bessel function of the first kind.
Special cases are:
J1(±Inf) = 0 J1(NaN) = NaN
func Jn ¶
Jn returns the order-n Bessel function of the first kind.
Special cases are:
Jn(n, ±Inf) = 0 Jn(n, NaN) = NaN
func Ldexp ¶
Ldexp is the inverse of Frexp. It returns frac × 2**exp.
Special cases are:
Ldexp(±0, exp) = ±0 Ldexp(±Inf, exp) = ±Inf Ldexp(NaN, exp) = NaN
func Lgamma ¶
Lgamma returns the natural logarithm and sign (-1 or +1) of Gamma(x).
Special cases are:
Lgamma(+Inf) = +Inf Lgamma(0) = +Inf Lgamma(-integer) = +Inf Lgamma(-Inf) = -Inf Lgamma(NaN) = NaN
func Log ¶
Log returns the natural logarithm of x.
Special cases are:
Log(+Inf) = +Inf Log(0) = -Inf Log(x < 0) = NaN Log(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
x := math.Log(1)
fmt.Printf("%.1f\n", x)
y := math.Log(2.7183)
fmt.Printf("%.1f\n", y)
}
Output: 0.0 1.0
func Log1p ¶
Log1p returns the natural logarithm of 1 plus its argument x. It is more accurate than Log(1 + x) when x is near zero.
Special cases are:
Log1p(+Inf) = +Inf Log1p(±0) = ±0 Log1p(-1) = -Inf Log1p(x < -1) = NaN Log1p(NaN) = NaN
func Log2 ¶
Log2 returns the binary logarithm of x. The special cases are the same as for Log.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.1f", math.Log2(256))
}
Output: 8.0
func Log10 ¶
Log10 returns the decimal logarithm of x. The special cases are the same as for Log.
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.1f", math.Log10(100))
}
Output: 2.0
func Logb ¶
Logb returns the binary exponent of x.
Special cases are:
Logb(±Inf) = +Inf Logb(0) = -Inf Logb(NaN) = NaN
func Max ¶
Max returns the larger of x or y.
Special cases are:
Max(x, +Inf) = Max(+Inf, x) = +Inf Max(x, NaN) = Max(NaN, x) = NaN Max(+0, ±0) = Max(±0, +0) = +0 Max(-0, -0) = -0
Note that this differs from the built-in function max when called with NaN and +Inf.
func Min ¶
Min returns the smaller of x or y.
Special cases are:
Min(x, -Inf) = Min(-Inf, x) = -Inf Min(x, NaN) = Min(NaN, x) = NaN Min(-0, ±0) = Min(±0, -0) = -0
Note that this differs from the built-in function min when called with NaN and -Inf.
func Mod ¶
Mod returns the floating-point remainder of x/y. The magnitude of the result is less than y and its sign agrees with that of x.
Special cases are:
Mod(±Inf, y) = NaN Mod(NaN, y) = NaN Mod(x, 0) = NaN Mod(x, ±Inf) = x Mod(x, NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
c := math.Mod(7, 4)
fmt.Printf("%.1f", c)
}
Output: 3.0
func Modf ¶
Modf returns integer and fractional floating-point numbers that sum to f. Both values have the same sign as f.
Special cases are:
Modf(±Inf) = ±Inf, NaN Modf(NaN) = NaN, NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
int, frac := math.Modf(3.14)
fmt.Printf("%.2f, %.2f\n", int, frac)
int, frac = math.Modf(-2.71)
fmt.Printf("%.2f, %.2f\n", int, frac)
}
Output: 3.00, 0.14 -2.00, -0.71
func Nextafter ¶
Nextafter returns the next representable float64 value after x towards y.
Special cases are:
Nextafter(x, y) = x when x == y Nextafter(0, y) = ±SmallestNonzeroFloat64 towards y, for y ≠ 0 Nextafter(NaN, y) = NaN Nextafter(x, NaN) = NaN
func Nextafter32 ¶ added in go1.4
Nextafter32 returns the next representable float32 value after x towards y.
Special cases are:
Nextafter32(x, y) = x when x == y Nextafter32(0, y) = ±SmallestNonzeroFloat32 towards y, for y ≠ 0 Nextafter32(NaN, y) = NaN Nextafter32(x, NaN) = NaN
func Pow ¶
Pow returns x**y, the base-x exponential of y.
Special cases are (in order):
Pow(x, ±0) = 1 for any x Pow(1, y) = 1 for any y Pow(x, 1) = x for any x Pow(NaN, y) = NaN Pow(x, NaN) = NaN Pow(±0, y) = ±Inf for y an odd integer < 0 Pow(±0, -Inf) = +Inf Pow(±0, +Inf) = +0 Pow(±0, y) = +Inf for finite y < 0 and not an odd integer Pow(±0, y) = ±0 for y an odd integer > 0 Pow(±0, y) = +0 for finite y > 0 and not an odd integer Pow(-1, ±Inf) = 1 Pow(x, +Inf) = +Inf for |x| > 1 Pow(x, -Inf) = +0 for |x| > 1 Pow(x, +Inf) = +0 for |x| < 1 Pow(x, -Inf) = +Inf for |x| < 1 Pow(+Inf, y) = +Inf for y > 0 Pow(+Inf, y) = +0 for y < 0 Pow(-Inf, y) = Pow(-0, -y) Pow(x, y) = NaN for finite x < 0 and finite non-integer y
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
c := math.Pow(2, 3)
fmt.Printf("%.1f", c)
}
Output: 8.0
func Pow10 ¶
Pow10 returns 10**n, the base-10 exponential of n.
Special cases are:
Pow10(n) = 0 for n < -323 Pow10(n) = +Inf for n > 308
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
c := math.Pow10(2)
fmt.Printf("%.1f", c)
}
Output: 100.0
func Remainder ¶
Remainder returns the IEEE 754 floating-point remainder of x/y.
Special cases are:
Remainder(±Inf, y) = NaN Remainder(NaN, y) = NaN Remainder(x, 0) = NaN Remainder(x, ±Inf) = x Remainder(x, NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.1f", math.Remainder(100, 30))
}
Output: 10.0
func Round ¶ added in go1.10
Round returns the nearest integer, rounding half away from zero.
Special cases are:
Round(±0) = ±0 Round(±Inf) = ±Inf Round(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
p := math.Round(10.5)
fmt.Printf("%.1f\n", p)
n := math.Round(-10.5)
fmt.Printf("%.1f\n", n)
}
Output: 11.0 -11.0
func RoundToEven ¶ added in go1.10
RoundToEven returns the nearest integer, rounding ties to even.
Special cases are:
RoundToEven(±0) = ±0 RoundToEven(±Inf) = ±Inf RoundToEven(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
u := math.RoundToEven(11.5)
fmt.Printf("%.1f\n", u)
d := math.RoundToEven(12.5)
fmt.Printf("%.1f\n", d)
}
Output: 12.0 12.0
func Sin ¶
Sin returns the sine of the radian argument x.
Special cases are:
Sin(±0) = ±0 Sin(±Inf) = NaN Sin(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Sin(math.Pi))
}
Output: 0.00
func Sincos ¶
Sincos returns Sin(x), Cos(x).
Special cases are:
Sincos(±0) = ±0, 1 Sincos(±Inf) = NaN, NaN Sincos(NaN) = NaN, NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
sin, cos := math.Sincos(0)
fmt.Printf("%.2f, %.2f", sin, cos)
}
Output: 0.00, 1.00
func Sinh ¶
Sinh returns the hyperbolic sine of x.
Special cases are:
Sinh(±0) = ±0 Sinh(±Inf) = ±Inf Sinh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Sinh(0))
}
Output: 0.00
func Sqrt ¶
Sqrt returns the square root of x.
Special cases are:
Sqrt(+Inf) = +Inf Sqrt(±0) = ±0 Sqrt(x < 0) = NaN Sqrt(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
const (
a = 3
b = 4
)
c := math.Sqrt(a*a + b*b)
fmt.Printf("%.1f", c)
}
Output: 5.0
func Tan ¶
Tan returns the tangent of the radian argument x.
Special cases are:
Tan(±0) = ±0 Tan(±Inf) = NaN Tan(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Tan(0))
}
Output: 0.00
func Tanh ¶
Tanh returns the hyperbolic tangent of x.
Special cases are:
Tanh(±0) = ±0 Tanh(±Inf) = ±1 Tanh(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f", math.Tanh(0))
}
Output: 0.00
func Trunc ¶
Trunc returns the integer value of x.
Special cases are:
Trunc(±0) = ±0 Trunc(±Inf) = ±Inf Trunc(NaN) = NaN
Example ¶
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.2f\n", math.Trunc(math.Pi))
fmt.Printf("%.2f\n", math.Trunc(-1.2345))
}
Output: 3.00 -1.00
func Y0 ¶
Y0 returns the order-zero Bessel function of the second kind.
Special cases are:
Y0(+Inf) = 0 Y0(0) = -Inf Y0(x < 0) = NaN Y0(NaN) = NaN
Types ¶
This section is empty.
Source Files
¶
- abs.go
- acosh.go
- asin.go
- asinh.go
- atan.go
- atan2.go
- atanh.go
- bits.go
- cbrt.go
- const.go
- copysign.go
- dim.go
- dim_asm.go
- erf.go
- erfinv.go
- exp.go
- exp2_noasm.go
- exp_amd64.go
- exp_asm.go
- expm1.go
- floor.go
- floor_asm.go
- fma.go
- frexp.go
- gamma.go
- hypot.go
- hypot_asm.go
- j0.go
- j1.go
- jn.go
- ldexp.go
- lgamma.go
- log.go
- log10.go
- log1p.go
- log_asm.go
- logb.go
- mod.go
- modf.go
- nextafter.go
- pow.go
- pow10.go
- remainder.go
- signbit.go
- sin.go
- sincos.go
- sinh.go
- sqrt.go
- stubs.go
- tan.go
- tanh.go
- trig_reduce.go
- unsafe.go
Directories
¶
| Path | Synopsis |
|---|---|
|
Package big implements arbitrary-precision arithmetic (big numbers).
|
Package big implements arbitrary-precision arithmetic (big numbers). |
|
internal/asmgen
Asmgen generates math/big assembly.
|
Asmgen generates math/big assembly. |
|
Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types.
|
Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types. |
|
Package cmplx provides basic constants and mathematical functions for complex numbers.
|
Package cmplx provides basic constants and mathematical functions for complex numbers. |
|
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work.
|
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work. |
|
v2
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work.
|
Package rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work. |