# aggregator

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##### A Simple Class for Aggregators

A class of objects designed to help aggregate calculations over an iterative computation. The aggregator consists of three objects. An environment to hold the values. A function that sets up an initial value the first time an object is seen. An aggregate function that increments the value of an object seen previously.

Keywords
classes, methods
##### Details

This class is used to help aggregate different values over function calls. A very simple example is to use leave one out cross-validation for prediction. At each stage we first perform feature selection and then cross-validate. To keep track of how often each feature is selected we can use an aggregator. At the end of the cross-validation we can extract the names of the features chosen from aggenv.

##### Creating Objects

new('aggregator', aggenv = [environment], initfun = [function], aggfun = [function])

##### Slots

aggenv:
Object of class 'environment', holds the values between iterations
initfun:
Object of class 'function' specifies how to initialize the value for a name the first time it is encountered
aggfun:
Object of class 'function' used to increment (or perform any other function) on a name

##### Methods

aggenv(aggregator):
Used to access the environment of the aggregator
aggfun(aggregator):
Used to access the function that aggregates
initfun(aggregator):
Used to access the initializer function

Aggregate

##### Aliases
• class:aggregator
• aggregator
• aggregator-class
• initialize,aggregator-method
• aggenv,aggregator-method
• aggfun,aggregator-method
• initfun,aggregator-method
Documentation reproduced from package Biobase, version 2.32.0, License: Artistic-2.0

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