Package gPy :: Module Variables

Module Variables

For manipulation of (random) variables

Classes

VariableError
Base class for errors in the Variables module

Domain
A domain is a set of random variables, implicitly representing all functions from joint instantiations of the variables

SubDomain
A subdomain is a domain together with a specified subset of the domain variables.

Functions

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Numeric

extdiv(x, y)
Return x/y where 0/0 = 0

source code

clear_default_domain()
Reset the internal default domain to be empty

source code

print_default_domain()
Print out the internal default domain

source code

set_default_domain(dict)
Set the internal default domain

source code

declare_variable(variable, values, must_be_new=False)
Add a variable and its associated values to the default domain

source code

change_variable(self, variable, values)
Change the values associated with a domain variable

source code

Variables

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String _version = '$Id: Variables.py,v 1.3 2008/10/07 09:14:46 jc Exp $'
Version of this module

_default_domain = Domain(None,{'A': frozenset(['1', '0']), 'Le...
Default domain

Imports: operator

Function Details

[hide private]

extdiv(x, y)

source code

Return x/y where 0/0 = 0

Parameters:

x (Numeric) - LHS of division
y (Numeric) - LHS of division

Returns: Numeric

x/y where 0/0 = 0

Raises:

ZeroDivisionError - If y==0 and x!=0.

set_default_domain(dict)

source code

Set the internal default domain

Any previous values will be deleted!

Parameters:

dict (Dictionary) - Mapping from each variable to the values it can have

declare_variable(variable, values, must_be_new=False)

source code

Add a variable and its associated values to the default domain

If variable already exists then a check is done to ensure that values is correct.

Parameters:

variable (Immutable) - The new variable
values (Iterable) - The values of the new variable
must_be_new (Boolean) - If the variable should be a new variable

Raises:

VariableError - If variable already exists with values different from values; Or if must_be_new is set and the variable already exists.

change_variable(self, variable, values)

source code

Change the values associated with a domain variable

Parameters:

variable (Immutable) - The variable
values (Iterable) - The new values of the variable

Raises:

KeyError - If variable is not in the domain

Variables Details

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_default_domain

Default domain

Initially empty. IGNORE any value given in epydoc documentation. If there is one this is just an unwanted by product of the way the documentation is produced.

Value:

Domain(None,{'A': frozenset(['1', '0']), 'LeaveOnTime': frozenset(['y'
, 'n']), 'B': frozenset(['1', '0']), 'D': frozenset(['1', '0']), 'Canc
er': frozenset(['absent', 'present']), 'Bronchitis': frozenset(['absen
t', 'present']), 'TbOrCa': frozenset(['false', 'true']), 'C': frozense
t(['1', '0']), 'CatchTrain': frozenset(['y', 'n']), 'XRay': frozenset(
['abnormal', 'normal']), 'WorkOnTime': frozenset(['y', 'n']), 'VisitAs
ia': frozenset(['no_visit', 'visit']), 'X3': frozenset(['1', '0']), 'T
uberculosis': frozenset(['absent', 'present']), 'Card2': frozenset([0,
...