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Biogeme: Python Library
2.5
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Class generating the analytical derivative of an expression. More...
Public Member Functions | |
| def | __init__ (self, term, v) |
| def | getExpression (self) |
 Public Member Functions inherited from bio_expression.Expression | |
| def | __init__ (self) |
| Constructor. | |
| def | getExpression (self) |
| def | getID (self) |
| def | __str__ (self) |
| def | __neg__ (self) |
| def | __add__ (self, expression) |
| def | __radd__ (self, expression) |
| def | __sub__ (self, expression) |
| def | __rsub__ (self, expression) |
| def | __mul__ (self, expression) |
| def | __rmul__ (self, expression) |
| def | __div__ (self, expression) |
| def | __rdiv__ (self, expression) |
| def | __truediv__ (self, expression) |
| Support for Python version 3.x. More... | |
| def | __rtruediv__ (self, expression) |
| Support for Python version 3.x. More... | |
| def | __mod__ (self, expression) |
| def | __pow__ (self, expression) |
| def | __rpow__ (self, expression) |
| def | __and__ (self, expression) |
| def | __or__ (self, expression) |
| def | __eq__ (self, expression) |
| def | __ne__ (self, expression) |
| def | __le__ (self, expression) |
| def | __ge__ (self, expression) |
| def | __lt__ (self, expression) |
| def | __gt__ (self, expression) |
Public Attributes | |
| function | |
| variable | |
| operatorIndex | |
| Public Attributes inherited from bio_expression.Expression | |
| operatorIndex | |
Class generating the analytical derivative of an expression.
This class generates the expression for
![\[ \frac{\partial f(x)}{\partial x} \]](form_17.png)
The computation of derivatives is usually not necessary for estimation, as Biogeme automatically generates the analytical derivatives of the log likelihood function. It is particularly usuful for simulation, to compute the elasticities of complex models. Example: The computation of the elasticity of a model prob with respect to the variable TRAIN_TT, say, is obtained as follows, whatever the model defined by prob:
Definition at line 814 of file bio_expression.py.
| def bio_expression.Derive.__init__ | ( | self, | |
| term, | |||
| v | |||
| ) |
| term | any valid bio_expression to derive |
| v | the variable |
Definition at line 817 of file bio_expression.py.
