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# Math
A set of wrappers around the functions from the libm library and the Yandex utilities.
## Constants {#constants}
#### List of functions
* `Math::Pi() -> Double`
* `Math::E() -> Double`
* `Math::Eps() -> Double`
#### Examples
```yql
SELECT Math::Pi(); -- 3.141592654
SELECT Math::E(); -- 2.718281828
SELECT Math::Eps(); -- 2.220446049250313e-16
```
## (Double) -> Bool {#double-bool}
#### List of functions
* `Math::IsInf(Double{Flags:AutoMap}) -> Bool`
* `Math::IsNaN(Double{Flags:AutoMap}) -> Bool`
* `Math::IsFinite(Double{Flags:AutoMap}) -> Bool`
#### Examples
```yql
SELECT Math::IsNaN(0.0/0.0); -- true
SELECT Math::IsFinite(1.0/0.0); -- false
```
## (Double) -> Double {#double-double}
#### List of functions
* `Math::Abs(Double{Flags:AutoMap}) -> Double`
* `Math::Acos(Double{Flags:AutoMap}) -> Double`
* `Math::Asin(Double{Flags:AutoMap}) -> Double`
* `Math::Asinh(Double{Flags:AutoMap}) -> Double`
* `Math::Atan(Double{Flags:AutoMap}) -> Double`
* `Math::Cbrt(Double{Flags:AutoMap}) -> Double`
* `Math::Ceil(Double{Flags:AutoMap}) -> Double`
* `Math::Cos(Double{Flags:AutoMap}) -> Double`
* `Math::Cosh(Double{Flags:AutoMap}) -> Double`
* `Math::Erf(Double{Flags:AutoMap}) -> Double`
* `Math::ErfInv(Double{Flags:AutoMap}) -> Double`
* `Math::ErfcInv(Double{Flags:AutoMap}) -> Double`
* `Math::Exp(Double{Flags:AutoMap}) -> Double`
* `Math::Exp2(Double{Flags:AutoMap}) -> Double`
* `Math::Fabs(Double{Flags:AutoMap}) -> Double`
* `Math::Floor(Double{Flags:AutoMap}) -> Double`
* `Math::Lgamma(Double{Flags:AutoMap}) -> Double`
* `Math::Rint(Double{Flags:AutoMap}) -> Double`
* `Math::Sigmoid(Double{Flags:AutoMap}) -> Double`
* `Math::Sin(Double{Flags:AutoMap}) -> Double`
* `Math::Sinh(Double{Flags:AutoMap}) -> Double`
* `Math::Sqrt(Double{Flags:AutoMap}) -> Double`
* `Math::Tan(Double{Flags:AutoMap}) -> Double`
* `Math::Tanh(Double{Flags:AutoMap}) -> Double`
* `Math::Tgamma(Double{Flags:AutoMap}) -> Double`
* `Math::Trunc(Double{Flags:AutoMap}) -> Double`
* `Math::Log(Double{Flags:AutoMap}) -> Double`
* `Math::Log2(Double{Flags:AutoMap}) -> Double`
* `Math::Log10(Double{Flags:AutoMap}) -> Double`
#### Examples
```yql
SELECT Math::Sqrt(256); -- 16
SELECT Math::Trunc(1.2345); -- 1
```
## (Double, Double) -> Double {#doubledouble-double}
#### List of functions
* `Math::Atan2(Double{Flags:AutoMap}, Double{Flags:AutoMap}) -> Double`
* `Math::Fmod(Double{Flags:AutoMap}, Double{Flags:AutoMap}) -> Double`
* `Math::Hypot(Double{Flags:AutoMap}, Double{Flags:AutoMap}) -> Double`
* `Math::Pow(Double{Flags:AutoMap}, Double{Flags:AutoMap}) -> Double`
* `Math::Remainder(Double{Flags:AutoMap}, Double{Flags:AutoMap}) -> Double`
#### Examples
```yql
SELECT Math::Atan2(1, 0); -- 1.570796327
SELECT Math::Remainder(2.1, 2); -- 0.1
```
## (Double, Int32) -> Double {#doubleint32-double}
#### List of functions
* `Math::Ldexp(Double{Flags:AutoMap}, Int32{Flags:AutoMap}) -> Double`
* `Math::Round(Double{Flags:AutoMap}, [Int32?]) -> Double`: The second argument indicates the power of 10 to which we round (it's negative for decimal digits and positive for rounding to tens, thousands, or millions); the default value is 0
#### Examples
```yql
SELECT Math::Pow(2, 10); -- 1024
SELECT Math::Round(1.2345, -2); -- 1.23
```
## (Double, Double, \[Double?\]) -> Bool {#doubledouble-bool}
#### List of functions
* `Math::FuzzyEquals(Double{Flags:AutoMap}, Double{Flags:AutoMap}, [Double?]) -> Bool`: Compares two Doubles for being inside the neighborhood specified by the third argument; the default value is 1.0e-13
#### Examples
```yql
SELECT Math::FuzzyEquals(1.01, 1.0, 0.05); -- true
```
## Functions for computing remainders
#### List of functions
* `Math::Mod(Int64{Flags:AutoMap}, Int64) -> Int64?`
* `Math::Rem(Int64{Flags:AutoMap}, Int64) -> Int64?`
These functions behave similarly to the built-in % operator in the case of non-negative arguments. The differences are noticeable in the case of negative arguments:
* `Math::Mod` preserves the sign of the second argument (the denominator).
* `Math::Rem` preserves the sign of the first argument (the numerator).
Functions return null if the divisor is zero.
#### Examples
```yql
SELECT Math::Mod(-1, 7); -- 6
SELECT Math::Rem(-1, 7); -- -1
```
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