类 AddExpression
java.lang.Object
weka.filters.Filter
weka.filters.unsupervised.attribute.AddExpression
- 所有已实现的接口:
Serializable
,CapabilitiesHandler
,OptionHandler
,RevisionHandler
,StreamableFilter
,UnsupervisedFilter
public class AddExpression
extends Filter
implements UnsupervisedFilter, StreamableFilter, OptionHandler
An instance filter that creates a new attribute by applying a mathematical expression to existing attributes. The expression can contain attribute references and numeric constants. Supported operators are :
+, -, *, /, ^, log, abs, cos, exp, sqrt, floor, ceil, rint, tan, sin, (, )
Attributes are specified by prefixing with 'a', eg. a7 is attribute number 7 (starting from 1).
Example expression : a1^2*a5/log(a7*4.0). Valid options are:
+, -, *, /, ^, log, abs, cos, exp, sqrt, floor, ceil, rint, tan, sin, (, )
Attributes are specified by prefixing with 'a', eg. a7 is attribute number 7 (starting from 1).
Example expression : a1^2*a5/log(a7*4.0). Valid options are:
-E <expression> Specify the expression to apply. Eg a1^2*a5/log(a7*4.0). Supported opperators: ,+, -, *, /, ^, log, abs, cos, exp, sqrt, floor, ceil, rint, tan, sin, (, ) (default: a1^2)
-N <name> Specify the name for the new attribute. (default is the expression provided with -E)
-D Debug. Names attribute with the postfix parse of the expression.
- 版本:
- $Revision: 5543 $
- 作者:
- Mark Hall (mhall@cs.waikato.ac.nz)
- 另请参阅:
-
构造器概要
构造器 -
方法概要
修饰符和类型方法说明Returns the tip text for this propertyReturns the tip text for this propertyReturns the Capabilities of this filter.boolean
getDebug()
Gets whether debug is setGet the expressiongetName()
Returns the name of the new attributeString[]
Gets the current settings of the filter.Returns the revision string.Returns a string describing this filterboolean
Input an instance for filtering.Returns an enumeration describing the available options.static void
Main method for testing this class.Returns the tip text for this propertyvoid
setDebug
(boolean d) Set debug mode.void
setExpression
(String expr) Set the expression to applyboolean
setInputFormat
(Instances instanceInfo) Sets the format of the input instances.void
Set the name for the new attribute.void
setOptions
(String[] options) Parses a given list of options.从类继承的方法 weka.filters.Filter
batchFilterFile, batchFinished, filterFile, getCapabilities, getOutputFormat, isFirstBatchDone, isNewBatch, isOutputFormatDefined, makeCopies, makeCopy, numPendingOutput, output, outputPeek, toString, useFilter, wekaStaticWrapper
-
构造器详细资料
-
AddExpression
public AddExpression()
-
-
方法详细资料
-
globalInfo
Returns a string describing this filter- 返回:
- a description of the filter suitable for displaying in the explorer/experimenter gui
-
listOptions
Returns an enumeration describing the available options.- 指定者:
listOptions
在接口中OptionHandler
- 返回:
- an enumeration of all the available options.
-
setOptions
Parses a given list of options. Valid options are:-E <expression> Specify the expression to apply. Eg a1^2*a5/log(a7*4.0). Supported opperators: ,+, -, *, /, ^, log, abs, cos, exp, sqrt, floor, ceil, rint, tan, sin, (, ) (default: a1^2)
-N <name> Specify the name for the new attribute. (default is the expression provided with -E)
-D Debug. Names attribute with the postfix parse of the expression.
- 指定者:
setOptions
在接口中OptionHandler
- 参数:
options
- the list of options as an array of strings- 抛出:
Exception
- if an option is not supported
-
getOptions
Gets the current settings of the filter.- 指定者:
getOptions
在接口中OptionHandler
- 返回:
- an array of strings suitable for passing to setOptions
-
nameTipText
Returns the tip text for this property- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
-
setName
Set the name for the new attribute. The string "expression" can be used to make the name of the new attribute equal to the expression provided.- 参数:
name
- the name of the new attribute
-
getName
Returns the name of the new attribute- 返回:
- the name of the new attribute
-
debugTipText
Returns the tip text for this property- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
-
setDebug
public void setDebug(boolean d) Set debug mode. Causes the new attribute to be named with the postfix parse of the expression- 参数:
d
- true if debug mode is to be used
-
getDebug
public boolean getDebug()Gets whether debug is set- 返回:
- true if debug is set
-
expressionTipText
Returns the tip text for this property- 返回:
- tip text for this property suitable for displaying in the explorer/experimenter gui
-
setExpression
Set the expression to apply- 参数:
expr
- a mathematical expression to apply
-
getExpression
Get the expression- 返回:
- the expression
-
getCapabilities
Returns the Capabilities of this filter.- 指定者:
getCapabilities
在接口中CapabilitiesHandler
- 覆盖:
getCapabilities
在类中Filter
- 返回:
- the capabilities of this object
- 另请参阅:
-
setInputFormat
Sets the format of the input instances.- 覆盖:
setInputFormat
在类中Filter
- 参数:
instanceInfo
- an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).- 返回:
- true if the outputFormat may be collected immediately
- 抛出:
Exception
- if the format couldn't be set successfully
-
input
Input an instance for filtering. Ordinarily the instance is processed and made available for output immediately. Some filters require all instances be read before producing output.- 覆盖:
input
在类中Filter
- 参数:
instance
- the input instance- 返回:
- true if the filtered instance may now be collected with output().
- 抛出:
IllegalStateException
- if no input format has been defined.Exception
- if there was a problem during the filtering.
-
getRevision
Returns the revision string.- 指定者:
getRevision
在接口中RevisionHandler
- 覆盖:
getRevision
在类中Filter
- 返回:
- the revision
-
main
Main method for testing this class.- 参数:
args
- should contain arguments to the filter: use -h for help
-