rhai/doc/src/language/num-fn.md

Numeric Functions

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Integer Functions

The following standard functions (defined in the [BasicMathPackage][packages] but excluded if using a [raw Engine]) operate on i8, i16, i32, i64, f32 and f64 only:

Function	No available under	Description
abs		absolute value
sign		returns -1 (INT) if the number is negative, +1 if positive, 0 if zero

Floating-Point Functions

The following standard functions (defined in the [BasicMathPackage][packages] but excluded if using a [raw Engine]) operate on f64 only:

Category	Functions
Trigonometry	sin, cos, tan, sinh, cosh, tanh in degrees
Arc-trigonometry	asin, acos, atan, asinh, acosh, atanh in degrees
Square root	sqrt
Exponential	exp (base e)
Logarithmic	ln (base e), log10 (base 10), log (any base)
Rounding	floor, ceiling, round, int, fraction methods and properties
Conversion	[to_int]
Testing	is_nan, is_finite, is_infinite methods and properties

Conversion Functions

The following standard functions (defined in the [BasicMathPackage][packages] but excluded if using a [raw Engine]) parse numbers:

Function	No available under	Description
[to_float]	[no_float]	converts an integer type to FLOAT
[parse_int]		converts a [string] to INT with an optional radix
[parse_float]	[no_float]	converts a [string] to FLOAT