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模組 mbcp.mp_math.equation ​

本模块定义了方程相关的类和函数以及一些常用的数学函数

class CurveEquation ​

method __init__(self, x_func: OneVarFunc, y_func: OneVarFunc, z_func: OneVarFunc) ​

説明: 曲线方程。

變數説明:

源碼 或 於GitHub上查看
python
def __init__(self, x_func: OneVarFunc, y_func: OneVarFunc, z_func: OneVarFunc):
    self.x_func = x_func
    self.y_func = y_func
    self.z_func = z_func

method self () *t: Var => Point3 | tuple[Point3, ...] ​

説明: 计算曲线上的点。

變數説明:

返回: 目标点

源碼 或 於GitHub上查看
python
def __call__(self, *t: Var) -> Point3 | tuple[Point3, ...]:
    if len(t) == 1:
        return Point3(self.x_func(t[0]), self.y_func(t[0]), self.z_func(t[0]))
    else:
        return tuple([Point3(x, y, z) for x, y, z in zip(self.x_func(t), self.y_func(t), self.z_func(t))])

func get_partial_derivative_func(func: MultiVarsFunc, var: int | tuple[int, ...], epsilon: Number = EPSILON) -> MultiVarsFunc ​

説明: 求N元函数一阶偏导函数。这玩意不太稳定，慎用。

WARNING

目前数学界对于一个函数的导函数并没有通解的说法，因此该函数的稳定性有待提升

變數説明:

返回: 偏导函数

抛出:

源碼 或 於GitHub上查看
python
def get_partial_derivative_func(func: MultiVarsFunc, var: int | tuple[int, ...], epsilon: Number=EPSILON) -> MultiVarsFunc:
    if isinstance(var, int):

        def partial_derivative_func(*args: Var) -> Var:
            args_list_plus = list(args)
            args_list_plus[var] += epsilon
            args_list_minus = list(args)
            args_list_minus[var] -= epsilon
            return (func(*args_list_plus) - func(*args_list_minus)) / (2 * epsilon)
        return partial_derivative_func
    elif isinstance(var, tuple):

        def high_order_partial_derivative_func(*args: Var) -> Var:
            result_func = func
            for v in var:
                result_func = get_partial_derivative_func(result_func, v, epsilon)
            return result_func(*args)
        return high_order_partial_derivative_func
    else:
        raise ValueError('Invalid var type')
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