Synopsis
Creates new attributes from nominal attributes which only contain substrings of the original attributes.
Description
This operator creates new attributes from nominal attributes where the new attributes contain only substrings of the original values. Please note that the counting starts with 1 and that the first and the last character will be included in the resulting substring. For example, the value is "RapidMiner" and the first index is set to 6 and the last index is set to 9 the result will be "Mine". If the last index is larger than the length of the word, the resulting substrings will end with the last character.
Input
- example set input: expects: ExampleSetMetaData: #examples: = 0; #attributes: 0
Output
- example set output:
- original:
Parameters
- attribute filter type: The condition specifies which attributes are selected or affected by this operator.
- attribute: The attribute which should be chosen.
- attributes: The attribute which should be chosen.
- regular expression: A regular expression for the names of the attributes which should be kept.
- use except expression: If enabled, an exception to the specified regular expression might be specified. Attributes of matching this will be filtered out, although matching the first expression.
- except regular expression: A regular expression for the names of the attributes which should be filtered out although matching the above regular expression.
- value type: The value type of the attributes.
- use value type exception: If enabled, an exception to the specified value type might be specified. Attributes of this type will be filtered out, although matching the first specified type.
- except value type: Except this value type.
- block type: The block type of the attributes.
- use block type exception: If enabled, an exception to the specified block type might be specified.
- except block type: Except this block type.
- numeric condition: Parameter string for the condition, e.g. '>= 5'
- invert selection: Indicates if only attributes should be accepted which would normally filtered.
- include special attributes: Indicate if this operator should also be applied on the special attributes. Otherwise they are always kept.
- first character index: The index of the first character of the substring which should be kept (counting starts with 1, 0: start with beginning of value).
- last character index: The index of the last character of the substring which should be kept (counting starts with 1, 0: end with end of value).