esys.escript.test_xml.ODETEST

Package esys :: Package escript :: Module test_xml :: Class ODETEST

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Type ODETEST

    object --+            
             |            
LinkableObject --+        
                 |        
      ParameterSet --+    
                     |    
                 Model --+
                         |
                        ODETEST

implements a solver for the ODE 

   du/dt=a*u+f(t)

we use a implicit euler scheme :

   u_n-u_{n-1}= dt*a u_n + st*f(t_n)

to get u_n we run an iterative process

    u_{n.k}=u_{n-1}+dt*(a u_{n.i-1} + f(t_n))


input for this model are step size dt, end time tend and a value for
a, f and initial value for u. we need also a tolerance tol for a
stopping criterion.

Method Summary
	`__init__(self, args, *kwargs)`
	`doInitialization(self)` Initializes the time stepping scheme.
	`doStep(self, dt)` Executes an iteration step at a time step.
	`doStepPostprocessing(self, dt)` Finalalizes the time step.
	`doStepPreprocessing(self, dt)` Sets up a time step of step size dt.
	`finalize(self)` Returns False if the time stepping is finalized.
	`getSafeTimeStepSize(self, dt)` Returns a time step size which can safely be used.
	`terminate(self)`
Inherited from Model
	`__str__(self)`
	`doFinalization(self)` Finalizes the time stepping.
	`terminateIteration(self)` Returns True if iteration on a time step is terminated.
	`toDom(self, document, node)` `toDom` method of Model class
	`writeXML(self, ostream)` Writes the object as an XML object into an output stream.
Inherited from ParameterSet
	`__delattr__(self, name)` Removes the attribute name.
	`__iter__(self)` Creates an iterator over the parameter and their values.
	`__repr__(self)`
	`declareParameter(self, **parameters)` Declares a new parameter(s) and its (their) initial value.
	`declareParameters(self, parameters)` Declares a set of parameters.
	`fromDom(cls, doc)` (Class method)
	`releaseParameters(self, name)` Removes parameter name from the paramameters.
	`showParameters(self)` Returns a descrition of the parameters.
Inherited from LinkableObject
	`__getattr__(self, name)` Returns the value of attribute name.
	`__setattr__(self, name, value)` Sets the value for attribute name.
	`getAttributeObject(self, name)` Return the object stored for attribute name.
	`hasAttribute(self, name)` Returns True if self as attribute name.
	`trace(self, msg)` If debugging is on, print the message, otherwise do nothing
Inherited from object
	`__getattribute__(...)` x.__getattribute__('name') <==> x.name
	`__hash__(x)` x.__hash__() <==> hash(x)
	`__new__(T, S, ...)` T.__new__(S, ...) -> a new object with type S, a subtype of T
	`__reduce__(...)` helper for pickle
	`__reduce_ex__(...)` helper for pickle

Class Variable Summary
Inherited from Model
`float`	`UNDEF_DT` = 1.0000000000000001e+300
Inherited from LinkableObject
`count`	`number_sequence` = `<itertools.count object at 0x401ff100>`

Instance Method Details