no_missing_values: This option simply selects all the attributes of the ExampleSet which don't contain a missing value in any example.When this option is selected some other parameters (block type, use block type exception) become visible in the Parameters panel. For example value_series_start and value_series_end block types both belong to the value_series block type. It should be noted that block types may be hierarchical. This option allows selection of all the attributes of a particular block type. block_type: This option is similar in working to the value_type option.When this option is selected some other parameters (value type, use value type exception) become visible in the Parameters panel.
User should have basic understanding of type hierarchy when selecting attributes through this option. For example real and integer types both belong to the numeric type. It should be noted that types are hierarchical. value_type: This option allows selection of all the attributes of a particular type.When this option is selected some other parameters (regular expression, use except expression) become visible in the Parameters panel. regular_expression: This option allows you to specify a regular expression for attribute selection.When this option is selected another parameter becomes visible in the Parameters panel.(Since RapidMiner 6.0.4 the Operator will fail if a selected Attribute is not in the ExampleSet) This option will not work if meta data is not known. All attributes of ExampleSet are present in the list required attributes can be easily selected. subset: This option allows selection of multiple attributes through a list.When this option is selected another parameter (attribute) becomes visible in the Parameters panel.(Since RapidMiner 6.0.4 the Operator will fail if a selected Attribute is not in the ExampleSet) single: This option allows selection of a single attribute.all: This option simply selects all the attributes of the ExampleSet.attribute_filter_typeThis parameter allows you to select the attribute selection filter the method you want to use for selecting attributes in which you want to make replacements.This is usually used to reuse the same ExampleSet in further operators or to view the ExampleSet in the Results Workspace. The ExampleSet that was given as input is passed without changing to the output through this port. The Retrieve operator provides meta data along-with data.Īn ExampleSet with replacements is output of this port. It is essential that meta data should be attached with the data for the input because attributes are specified in their meta data. The output of other operators can also be used as input. It is output of the Retrieve operator in the attached Example Process. Please keep in mind that although regular expressions are much more powerful than simple strings, you might simply enter characters to search for. The replacement can be empty and can contain capturing groups. Attribute values of selected attributes that match this regular expression are replaced by the specified replacement. This operator allows you to select attributes to make replacements in and to specify a regular expression. SynopsisThis operator replaces parts of the values of selected nominal attributes matching a specified regular expression by a specified replacement.
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