235 lines
4.5 KiB
Python
235 lines
4.5 KiB
Python
"""
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math 模块提供了对 C 标准定义的数学函数的访问。
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本模块需要带有硬件 FPU，精度是32位，这个模块需要浮点功能支持。
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"""
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e = ... # type: int
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pi = ... # type: int
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def acos(x) -> None:
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"""传入弧度值，计算cos(x)的反三角函数。"""
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...
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def acosh(x) -> None:
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"""返回 x 的逆双曲余弦。"""
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...
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def asin(x) -> None:
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"""传入弧度值，计算sin(x)的反三角函数。 示例：
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- x = math.asin(0.5)
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- print(x)
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0.5235988"""
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...
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def asinh(x) -> None:
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"""返回 x 的逆双曲正弦。"""
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...
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def atan(x) -> None:
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"""返回 x 的逆切线。"""
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...
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def atan2(y, x) -> None:
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"""Return the principal value of the inverse tangent of y/x."""
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...
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def atanh(x) -> None:
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"""Return the inverse hyperbolic tangent of x."""
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...
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def ceil(x) -> None:
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"""向上取整。 示例：
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- x = math.ceil(5.6454)
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- print(x)
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- 6
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"""
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...
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def copysign(x, y) -> None:
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"""Return x with the sign of y."""
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...
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def cos(x) -> None:
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"""传入弧度值，计算余弦。 示例：计算cos60°
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- math.cos(math.radians(60))
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- 0.5
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"""
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...
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def cosh(x) -> None:
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"""Return the hyperbolic cosine of x."""
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...
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def degrees(x) -> None:
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"""弧度转化为角度。 示例：
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- x = math.degrees(1.047198)
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- print(x)
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- 60.00002"""
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...
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def erf(x) -> None:
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"""Return the error function of x."""
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...
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def erfc(x) -> None:
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"""Return the complementary error function of x."""
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...
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def exp(x) -> None:
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"""计算e的x次方（幂）。
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示例：
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- x = math.exp(2)
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- print(x)
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- 7.389056"""
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...
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def expm1(x) -> None:
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"""计算 math.exp(x) - 1。"""
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...
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def fabs(x) -> None:
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"""计算绝对值。 示例：
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- x = math.fabs(-5)
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- print(x)
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- 5.0
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- y = math.fabs(5.0)
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- print(y)
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- 5.0
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"""
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...
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def floor(x) -> None:
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"""向下取整。 示例：
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- x = math.floor(2.99)
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- print(x)
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2
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- y = math.floor(-2.34)
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- print(y)
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-3
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"""
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...
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def fmod(x, y) -> None:
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"""取x除以y的模。 示例：
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- x = math.fmod(4, 5)
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- print(x)
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4.0
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"""
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...
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def frexp(x) -> None:
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"""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."""
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...
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def gamma(x) -> None:
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"""返回伽马函数。 示例：
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- x = math.gamma(5.21)
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- print(x)
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33.08715。
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"""
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...
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def isfinite(x) -> None:
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"""Return True if x is finite."""
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...
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def isinf(x) -> None:
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"""Return True if x is infinite."""
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...
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def isnan(x) -> None:
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"""Return True if x is not-a-number"""
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...
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def ldexp(x, exp) -> None:
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"""Return x * (2**exp)."""
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...
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def lgamma(x) -> None:
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"""返回伽马函数的自然对数。 示例：
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- x = math.lgamma(5.21)
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- print(x)
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3.499145"""
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...
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def log(x) -> None:
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"""计算以e为底的x的对数。 示例：
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- x = math.log(10)
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- print(x)
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2.302585"""
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...
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def log10(x) -> None:
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"""计算以10为底的x的对数。 示例：
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- x = math.log10(10)
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- print(x)
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1.0"""
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...
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def log2(x) -> None:
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"""计算以2为底的x的对数。 示例：
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- x = math.log2(8)
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- print(x)
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3.0"""
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...
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def modf(x) -> None:
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"""Return a tuple of two floats, being the fractional and integral parts of x. Both return values have the same sign as x."""
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...
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def pow(x, y) -> None:
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"""计算 x 的 y 次方（幂）。 示例：
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- x = math.pow(2, 3)
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- print(x)
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8.0"""
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...
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def radians(x) -> None:
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"""角度转化为弧度。 示例：
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- x = math.radians(60)
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- print(x)
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1.047198"""
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...
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def sin(x) -> None:
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"""传入弧度值，计算正弦。 示例：计算sin90°
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- math.sin(math.radians(90))
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1.0"""
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...
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def sinh(x) -> None:
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"""Return the hyperbolic sine of x."""
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...
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def sqrt(x) -> None:
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"""
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计算平方根。
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示例：
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- x = math.sqrt(9)
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- print(x)
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3.0"""
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...
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def tan(x) -> None:
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"""
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传入弧度值，计算正切。 示例：计算tan60°
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- math.tan(math.radians(60))
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1.732051"""
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...
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def tanh(x) -> None:
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"""Return the hyperbolic tangent of x."""
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...
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def trunc(x) -> None:
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"""
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取整。
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示例：
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- x = math.trunc(5.12)
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- print(x)
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5
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- y = math.trunc(-6.8)
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- print(y)
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-6"""
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...
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