math

Module math provides constants and mathematical functions. It is primarily a wrapper of the Go math (opens in a new tab) package, however it also includes a sum function for summing a list of numbers.

Risor provides equivalence between float and int types, so many of the functions in this module accept both float and int as inputs. In the documentation below, "number" is used to refer to either float or int.

Constants

PI

Constant

PI float

Example

>>> math.PI
3.141592653589793

E

Constant

E float

Example

>>> math.E
2.718281828459045

Functions

abs

Function signature

abs(x number) number

Returns the absolute value of x.

Example

>>> math.abs(-2)
2
>>> math.abs(3.3)
3.3

atan2

Function signature

atan2(y, x number) number

Returns the arc tangent value of y/x.

Example

>>> math.atan2(1, 2)
0.4636476090008061

sqrt

Function signature

sqrt(x number) float

Returns the square root of x.

Example

>>> math.sqrt(4)
2
>>> math.sqrt(2)
1.4142135623730951

min

Function signature

min(x, y number) float

Returns the smaller of x or y.

Example

>>> math.min(1, 2)
1.0
>>> math.min(3, -2.5)
-2.5

max

Function signature

max(x, y number) float

Returns the larger of x or y.

Example

>>> math.max(1, 2)
2.0
>>> math.max(-3, 2.5)
2.5

floor

Function signature

floor(x number) number

Returns the largest integer value less than or equal to x.

Example

>>> math.floor(2.5)
2
>>> math.floor(-2.5)
-3
>>> math.floor(3)
3

ceil

Function signature

ceil(x number) number

Returns the smallest integer value greater than or equal to x.

Example

>>> math.ceil(2.5)
3
>>> math.ceil(-2.5)
-2

sin

Function signature

sin(x number) float

Returns the sine of x.

Example

>>> math.sin(0)
0
>>> math.sin(math.PI / 2)
1

cos

Function signature

cos(x number) float

Returns the cosine of x.

Example

>>> math.cos(0)
1
>>> math.cos(math.PI / 2)
0

tan

Function signature

tan(x number) float

Returns the tangent of x.

Example

>>> math.tan(0)
0
>>> math.tan(math.PI / 4)
0.9999999999999998

mod

Function signature

mod(x, y number) float

Returns the remainder of x divided by y.

Example

>>> math.mod(5, 2)
1
>>> math.mod(5, 3)
2

log

Function signature

log(x number) float

Returns the natural logarithm of x.

Example

>>> math.log(1)
0
>>> math.log(math.E)
1

log10

Function signature

log10(x number) float

Returns the base 10 logarithm of x.

Example

>>> math.log10(1)
0
>>> math.log10(10)
1

log2

Function signature

log2(x number) float

Returns the base 2 logarithm of x.

Example

>>> math.log2(1)
0
>>> math.log2(8)
3

pow

Function signature

pow(x, y number) float

Returns x raised to the power of y.

Example

>>> math.pow(2, 3)
8
>>> math.pow(2, 0.5)
1.4142135623730951

pow10

Function signature

pow10(x number) float

Returns 10 raised to the power of x.

Example

>>> math.pow10(0)
1
>>> math.pow10(1)
10
>>> math.pow10(2)
100

inf

Function signature

inf(x number) float

Inf returns positive infinity if sign >= 0, negative infinity if sign < 0.

Example

>>> math.inf()
+Inf

is_inf

Function signature

is_inf(x number) bool

Returns true if x is positive or negative infinity.

Example

>>> math.is_inf(math.inf)
true
>>> math.is_inf(-math.inf)
true
>>> math.is_inf(0)
false

round

Function signature

round(x number) float

Returns x rounded to the nearest integer.

Example

>>> math.round(1.4)
1
>>> math.round(1.5)
2

sum

Function signature

sum(list) float

Returns the sum of all numbers in a list.

Example

>>> math.sum([1, 2, 3])
6
>>> math.sum([])
0

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