nineml.abstraction_layer.component.TimeDerivative

class nineml.abstraction_layer.component.TimeDerivative(dependent_variable, rhs)

Represents a first-order, ordinary differential equation with respect to time.

__init__(dependent_variable, rhs)

Time Derivative Constructor

Parameters:

• dependent_variable – A string containing a single symbol, which is the dependent_variable.
• rhs – A string containing the right-hand-side of the equation.

For example, if our time derivative was:

Then this would be constructed as:

TimeDerivative( dependent_variable='g', rhs='g/gtau' )

Note that although initially the time variable (independent_variable) is t, this can be changed using the methods: td.lhs_name_transform_inplace({'t':'T'} ) for example.

Methods

__init__(dependent_variable, rhs)	Time Derivative Constructor
accept_visitor(visitor, **kwargs)	link to something about visitation.
lhs_name_transform_inplace(name_map)	Replace atoms on the LHS with mapping in name_map
name_transform_inplace(name_map)
rhs_as_python_func([namespace])	Returns a python callable which evaluates the expression in
rhs_has_missing_functions()	returns True if at least 1 function on the RHS is not in the math
rhs_name_transform_inplace(name_map)	Replace atoms on the RHS with values in the name_map

Attributes

atoms	Returns a list of the atoms in the LHS and RHS of this expression
dependent_variable	Return the dependent variable
independent_variable	Return the independent variable
lhs	Return a string of the lhs of the form: ‘dS/dt’
lhs_atoms
rhs
rhs_atoms	Returns an iterator over all the variable names and mathematical
rhs_funcs
rhs_missing_functions	yield names of functions in the RHS which are not in the math
rhs_names

accept_visitor(visitor, **kwargs)

link to something about visitation.

lhs_name_transform_inplace(name_map)

Replace atoms on the LHS with mapping in name_map

name_transform_inplace(name_map)

rhs_as_python_func(namespace=None)

Returns a python callable which evaluates the expression in namespace and returns the result

rhs_has_missing_functions()

returns True if at least 1 function on the RHS is not in the math namespace

rhs_name_transform_inplace(name_map)

Replace atoms on the RHS with values in the name_map

atoms

Returns a list of the atoms in the LHS and RHS of this expression

dependent_variable

Return the dependent variable

independent_variable

Return the independent variable

lhs

Return a string of the lhs of the form: ‘dS/dt’

lhs_atoms

rhs

rhs_atoms

Returns an iterator over all the variable names and mathematical functions on the RHS function. This does not include defined mathematical symbols such as pi and e, but does include functions such as sin and log

rhs_funcs

rhs_missing_functions

yield names of functions in the RHS which are not in the math namespace

rhs_names