本文整理汇总了Python中sympy.core.function.UndefinedFunction类的典型用法代码示例。如果您正苦于以下问题：Python UndefinedFunction类的具体用法？Python UndefinedFunction怎么用？Python UndefinedFunction使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了UndefinedFunction类的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: implemented_function
def implemented_function(symfunc, implementation):
""" Add numerical ``implementation`` to function ``symfunc``.
``symfunc`` can be an ``UndefinedFunction`` instance, or a name string.
In the latter case we create an ``UndefinedFunction`` instance with that
name.
Be aware that this is a quick workaround, not a general method to create
special symbolic functions. If you want to create a symbolic function to be
used by all the machinery of SymPy you should subclass the ``Function``
class.
Parameters
----------
symfunc : ``str`` or ``UndefinedFunction`` instance
If ``str``, then create new ``UndefinedFunction`` with this as
name. If `symfunc` is a sympy function, attach implementation to it.
implementation : callable
numerical implementation to be called by ``evalf()`` or ``lambdify``
Returns
-------
afunc : sympy.FunctionClass instance
function with attached implementation
Examples
========
>>> from sympy.abc import x
>>> from sympy.utilities.lambdify import lambdify, implemented_function
>>> from sympy import Function
>>> f = implemented_function(Function('f'), lambda x: x+1)
>>> lam_f = lambdify(x, f(x))
>>> lam_f(4)
5
"""
# Delayed import to avoid circular imports
from sympy.core.function import UndefinedFunction
# if name, create function to hold implementation
if isinstance(symfunc, string_types):
symfunc = UndefinedFunction(symfunc)
elif not isinstance(symfunc, UndefinedFunction):
raise ValueError('symfunc should be either a string or'
' an UndefinedFunction instance.')
# We need to attach as a method because symfunc will be a class
symfunc._imp_ = staticmethod(implementation)
return symfunc示例2: implemented_function
def implemented_function(symfunc, implementation):
""" Add numerical `implementation` to function `symfunc`
`symfunc` can by a Function, or a name, in which case we make an
anonymous function with this name. The function is anonymous in the
sense that the name is not unique in the sympy namespace.
Parameters
----------
symfunc : str or ``sympy.FunctionClass`` instance
If str, then create new anonymous sympy function with this as
name. If `symfunc` is a sympy function, attach implementation to
function
implementation : callable
numerical implementation of function for use in ``lambdify``
Returns
-------
afunc : sympy.FunctionClass instance
function with attached implementation
Examples
--------
>>> from sympy.abc import x, y, z
>>> from sympy.utilities.lambdify import lambdify, implemented_function
>>> from sympy import Function
>>> f = implemented_function(Function('f'), lambda x : x+1)
>>> lam_f = lambdify(x, f(x))
>>> lam_f(4)
5
"""
# Delayed import to avoid circular imports
from sympy.core.function import UndefinedFunction
# if name, create anonymous function to hold implementation
if isinstance(symfunc, basestring):
symfunc = UndefinedFunction(symfunc)
# We need to attach as a method because symfunc will be a class
symfunc._imp_ = staticmethod(implementation)
return symfunc