micropython/docs/Development_manual_document_section/03-Basic_Module/04-math.md

math – 数学函数

!!! tip "简介"

`math` 模块提供了对 C 标准定义的数学函数的访问。 

**注意** : 需要带有硬件FPU，精度是32位，这个模块需要浮点功能支持。

函数

• math.acos(x)
  返回 x 的反余弦。

• math.acosh(x)
  返回 x 的逆双曲余弦。

• math.asin(x)
  返回 x 的反正弦。

• math.asinh(x)
  返回x 的逆双曲正弦。

• math.atan(x)
  返回 x 的逆切线。

• math.atan2(y, x)
  Return the principal value of the inverse tangent of y/x.

• math.atanh(x)
  Return the inverse hyperbolic tangent of x.

• math.ceil(x)
  Return an integer, being x rounded towards positive infinity.

• math.copysign(x, y)
  Return x with the sign of y.

• math.cos(x)
  Return the cosine of x.

• math.cosh(x)
  Return the hyperbolic cosine of x.

• math.degrees(x)
  Return radians x converted to degrees.

• math.erf(x)
  Return the error function of x.

• math.erfc(x)
  Return the complementary error function of x.

• math.exp(x)
  Return the exponential of x.

• math.expm1(x)
  Return exp(x) - 1.

• math.fabs(x)
  Return the absolute value of x.

• math.floor(x)
  Return an integer, being x rounded towards negative infinity.

• math.fmod(x, y)
  Return the remainder of x/y.

• math.frexp(x)
  Decomposes a floating-point number into its mantissa and exponent. The returned value is the tuple (m, e) such that x == m * 2**e exactly. If x == 0 then the function returns (0.0, 0), otherwise the relation 0.5 <= abs(m) < 1 holds.

• math.gamma(x)
  Return the gamma function of x.

• math.isfinite(x)
  Return True if x is finite.

• math.isinf(x)
  Return True if x is infinite.

• math.isnan(x)
  Return True if x is not-a-number

• math.ldexp(x, exp)
  Return x * (2**exp).

• math.lgamma(x)
  Return the natural logarithm of the gamma function of x.

• math.log(x)
  Return the natural logarithm of x.

• math.log10(x)
  Return the base-10 logarithm of x.

• math.log2(x)
  Return the base-2 logarithm of x.

• math.modf(x)
  Return a tuple of two floats, being the fractional and integral parts of x. Both return values have the same sign as x.

• math.pow(x, y)
  Returns x to the power of y.

• math.radians(x)
  Return degrees x converted to radians.

• math.sin(x)
  Return the sine of x.

• math.sinh(x)
  Return the hyperbolic sine of x.

• math.sqrt(x)
  Return the square root of x.

• math.tan(x)
  Return the tangent of x.

• math.tanh(x)
  Return the hyperbolic tangent of x.

• math.trunc(x)
  返回一个整数, x 接近于0。

常数

• math.e
  自然对数的底

• math.pi
  圆周率

更多内容可参考 math 。

---