-spec acos(X) -> float() when X :: number().

Returns the arc cosine of X in radians.

Examples

1> math:acos(1.0).
0.0

-spec acosh(X) -> float() when X :: number().

Returns the inverse hyperbolic cosine of X.

Examples

1> math:acosh(1.0).
0.0

-spec asin(X) -> float() when X :: number().

Returns the arc cosine of X in radians.

Examples

1> math:asin(0.0).
0.0

-spec asinh(X) -> float() when X :: number().

Returns the inverse hyperbolic sine of X.

Examples

1> math:asinh(0.0).
0.0

-spec atan2(Y, X) -> float() when Y :: number(), X :: number().

Returns the arc tangent of Y/X in radians, using the signs of both arguments to determine the quadrant of the return value.

Examples

1> math:atan2(0.0, -10.0).
3.141592653589793

-spec atan(X) -> float() when X :: number().

Returns the arc tangent of X in radians.

Examples

1> math:atan(0.0).
0.0

-spec atanh(X) -> float() when X :: number().

Returns the inverse hyperbolic tangent of X.

Examples

1> math:atanh(0.0).
0.0

-spec ceil(X) -> float() when X :: number().

Returns the ceiling of X.

Examples

1> math:ceil(7.5).
8.0
2> math:ceil(-5.5).
-5.0
3> math:ceil(1.0).
1.0

-spec cos(X) -> float() when X :: number().

Returns the cosine of X in radians.

Examples

1> math:cos(0.0)
1.0

-spec cosh(X) -> float() when X :: number().

Returns the hyperbolic cosine of X.

Examples

1> math:cosh(0.0)
1.0

-spec erf(X) -> float() when X :: number().

Returns the error function of X.

See Error function (Wikipedia).

Examples

1> math:erf(0.0).
0.0
2> math:erf(10.0).
1.0

-spec erfc(X) -> float() when X :: number().

Returns 1.0 - erf(X), computed using methods that avoid cancellation for large X.

Examples

1> math:erfc(0.0).
1.0

-spec exp(X) -> float() when X :: number().

Returns e raised to the power of X.

Examples

1> math:exp(0).
1.0
2> trunc(100 * math:exp(1)).
271

-spec floor(X) -> float() when X :: number().

Returns the floor of X.

Examples

1> math:floor(9.1).
9.0
2> math:floor(-1.5).
-2.0
3> math:floor(1.0)
1.0

-spec fmod(X, Y) -> float() when X :: number(), Y :: number().

Returns the floating point remainder X divided by Y.

Examples

1> math:fmod(10.5, 8.0).
2.5

-spec log2(X) -> float() when X :: number().

Returns logarithm of X to base 2.

Examples

1> math:log2(1.0).
0.0
2> math:log2(2.0).
1.0
3> math:log2(64).
6.0

-spec log10(X) -> float() when X :: number().

Returns logarithm of X to base 10.

Examples

1> math:log10(1.0).
0.0
2> math:log10(10.0).
1.0
3> math:log10(100).
2.0

-spec log(X) -> float() when X :: number().

Returns the natural logarithm of X.

Examples

1> math:log(1.0).
0.0
2> math:log(2.718281828459045).
1.0

-spec pi() -> float().

Returns the ratio of the circumference of a circle to its diameter.

Examples

1> math:pi().
3.141592653589793

-spec pow(X, N) -> float() when X :: number(), N :: number().

Raise X to the power N.

Examples

1> math:pow(2, 6).
64.0
2> math:pow(10.0, 3.0).
1000.0

-spec sin(X) -> float() when X :: number().

Returns the sine of X in radians.

Examples

1> math:sin(0.0)
0.0

-spec sinh(X) -> float() when X :: number().

Returns the hyperbolic sine of X.

Examples

1> math:sinh(0.0)
0.0

-spec sqrt(X) -> float() when X :: number().

Returns the non-negative square root of X.

Examples

1> math:sqrt(2).
1.4142135623730951
2> math:sqrt(100.0).
10.0

-spec tan(X) -> float() when X :: number().

Returns the tangent of X in radians.

Examples

1> math:tan(0.0)
0.0

-spec tanh(X) -> float() when X :: number().

Returns the hyperbolic tangent of X.

Examples

1> math:tan(0.0)
0.0

-spec tau() -> float().

Returns the ratio of the circumference of a circle to its radius.

This constant is equivalent to a full turn when described in radians.

Examples

1> math:tau().
6.283185307179586
2> math:tau() == 2 * math:pi().
true