定义
def root(fun, x0, args=(), method='hybr', jac=None, tol=None, callback=None,
options=None):
"""
Find a root of a vector function. 查找向量函数的根
Parameters
----------
fun : callable
A vector function to find a root of. 查找根的向量函数
x0 : ndarray
Initial guess. 初步猜测。
args : tuple, optional
Extra arguments passed to the objective function and its Jacobian. 额外的参数传递给目标函数及其Jacobian函数。
method : str, optional
Type of solver. Should be one of
- 'hybr' :ref:`(see here) `
- 'lm' :ref:`(see here) `
- 'broyden1' :ref:`(see here) `
- 'broyden2' :ref:`(see here) `
- 'anderson' :ref:`(see here) `
- 'linearmixing' :ref:`(see here) `
- 'diagbroyden' :ref:`(see here) `
- 'excitingmixing' :ref:`(see here) `
- 'krylov' :ref:`(see here) `
- 'df-sane' :ref:`(see here) `
jac : bool or callable, optional
If `jac` is a Boolean and is True, `fun` is assumed to return the
value of Jacobian along with the objective function. If False, the
Jacobian will be estimated numerically.
`jac` can also be a callable returning the Jacobian of `fun`. In
this case, it must accept the same arguments as `fun`.
bool 或 callable, 可选参数
如果jac是布尔值且为True，则假定fun与目标函数一起返回Jacobian的值。如果为False，则 将根据数值估算雅可比行列式。杰克(jac)也可以成为回味乐趣的雅可比式的可呼唤。在这种情况 下，它必须接受与fun相同的参数。
tol : float, optional
Tolerance for termination. For detailed control, use solver-specific
options.
终止公差。要进行详细控制，请使用solver-specific选项。
callback : function, optional
Optional callback function. It is called on every iteration as
``callback(x, f)`` where `x` is the current solution and `f`
the corresponding residual. For all methods but 'hybr' and 'lm'.
可选的回调函数。在每次迭代中都被称为callback(x, f)其中x是当前解，f是相应的残差。对于除‘hybr’和‘lm’之外的所有方法。
options : dict, optional
A dictionary of solver options. E.g. `xtol` or &#
