math – 数学函数

This module implements a subset of the corresponding CPython module, as described below. For more information, refer to the original CPython documentation: math .

math module provides some basic mathematical functions for working with floating-point numbers.

注意： On the pyboard, floating-point numbers have 32-bit precision.

Availability: not available on WiPy. Floating point support required for this module.

函数

math. acos ( x )

Return the inverse cosine of x .

math. acosh ( x )

Return the inverse hyperbolic cosine of x .

math. asin ( x )

Return the inverse sine of x .

math. asinh ( x )

Return the inverse hyperbolic sine of x .

math. atan ( x )

Return the inverse tangent of x .

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 )

返回 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 )

返回 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) 这样 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 )

返回 True if x is finite.

math. isinf ( x )

返回 True if x is infinite.

math. isnan ( x )

返回 True if x is not-a-number

math. ldexp ( x , exp )

返回 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 )

返回 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 )

Return an integer, being x rounded towards 0.

常量

math. e

base of the natural logarithm

math. pi

the ratio of a circle’s circumference to its diameter