def variance(source: ObservableBase) -> ObservableBase:
"""
Returns the statistical variance of the numerical emissions.
The sequence must be finite.
"""
squared_values = source.to_list() \
.flat_map(lambda l: Observable.from_(l).average().flat_map(lambda avg: Observable.from_(l).map(lambda i: i - avg))) \
.map(lambda i: i * i) \
.publish() \
.auto_connect(2)
return Observable.zip(squared_values.sum(), squared_values.count(), lambda sum, ct: sum / (ct - 1))
def zip_list(cls, *args):
"""Merge the specified observable sequences into one observable
sequence by emitting a list with the elements of the observable
sequences at corresponding indexes.
Arguments:
args (Tuple): Observable sources.
Returns:
Observable: Returns an observable sequence containing lists of
elements at corresponding indexes.
"""
def result(*args):
return list(args)
args += (result,)
return Observable.zip(*args)
def zip_list(cls, *args):
"""Merge the specified observable sequences into one observable
sequence by emitting a list with the elements of the observable
sequences at corresponding indexes.
Keyword arguments:
:param Observable cls: Class
:param Tuple args: Observable sources.
:return: Returns an observable sequence containing lists of
elements at corresponding indexes.
:rtype: Observable
"""
def result(*args):
return list(args)
args += (result, )
return Observable.zip(*args)
def zip_list(cls, *args):
"""Merge the specified observable sequences into one observable
sequence by emitting a list with the elements of the observable
sequences at corresponding indexes.
Keyword arguments:
:param Observable cls: Class
:param Tuple args: Observable sources.
:return: Returns an observable sequence containing lists of
elements at corresponding indexes.
:rtype: Observable
"""
def result(*args):
return list(args)
args += (result,)
return Observable.zip(*args)
