How can I remove the $ symbol from my attributes?

Alex2398Alex2398 Member Posts: 3 Newbie
I have 4 attributes in my data set with polynomial values that I would like to transform into numerical values but I can't because I have the $ symbol in front of them
How can I remove it?

Best Answer

  • BalazsBaranyBalazsBarany Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert Posts: 955 Unicorn
    Solution Accepted

    it works perfectly with test data similar to yours.
    <?xml version="1.0" encoding="UTF-8"?><process version="9.8.001">
      <operator activated="true" class="process" compatibility="9.8.001" expanded="true" name="Process">
        <parameter key="logverbosity" value="init"/>
        <parameter key="random_seed" value="-1"/>
        <parameter key="send_mail" value="never"/>
        <parameter key="notification_email" value=""/>
        <parameter key="process_duration_for_mail" value="30"/>
        <parameter key="encoding" value="SYSTEM"/>
        <process expanded="true">
          <operator activated="true" class="utility:create_exampleset" compatibility="9.8.001" expanded="true" height="68" name="Dollar amounts" width="90" x="45" y="34">
            <parameter key="generator_type" value="comma separated text"/>
            <parameter key="number_of_examples" value="100"/>
            <parameter key="use_stepsize" value="false"/>
            <list key="function_descriptions"/>
            <parameter key="add_id_attribute" value="false"/>
            <list key="numeric_series_configuration"/>
            <list key="date_series_configuration"/>
            <list key="date_series_configuration (interval)"/>
            <parameter key="date_format" value="yyyy-MM-dd HH:mm:ss"/>
            <parameter key="time_zone" value="SYSTEM"/>
            <parameter key="input_csv_text" value="close&#10;$ 16.32&#10;$&#9;17.25&#10; $11.75"/>
            <parameter key="column_separator" value=","/>
            <parameter key="parse_all_as_nominal" value="false"/>
            <parameter key="decimal_point_character" value="."/>
            <parameter key="trim_attribute_names" value="true"/>
          <operator activated="true" class="replace" compatibility="9.8.001" expanded="true" height="82" name="Replace" width="90" x="179" y="34">
            <parameter key="attribute_filter_type" value="all"/>
            <parameter key="attribute" value=""/>
            <parameter key="attributes" value=""/>
            <parameter key="use_except_expression" value="false"/>
            <parameter key="value_type" value="nominal"/>
            <parameter key="use_value_type_exception" value="false"/>
            <parameter key="except_value_type" value="file_path"/>
            <parameter key="block_type" value="single_value"/>
            <parameter key="use_block_type_exception" value="false"/>
            <parameter key="except_block_type" value="single_value"/>
            <parameter key="invert_selection" value="false"/>
            <parameter key="include_special_attributes" value="false"/>
            <parameter key="replace_what" value="^ *\$ *"/>
          <connect from_op="Dollar amounts" from_port="output" to_op="Replace" to_port="example set input"/>
          <connect from_op="Replace" from_port="example set output" to_port="result 1"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>

    Hint: In the regular expression input box you can experiment with the RE on a test string and interactively refine the it. This helps a lot when developing regexes.

    Regards, Balázs


  • MartinLiebigMartinLiebig Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, University Professor Posts: 3,453 RM Data Scientist
    check out the replace operator or replace in Turbo Prep.

    - Sr. Director Data Solutions, Altair RapidMiner -
    Dortmund, Germany
  • Alex2398Alex2398 Member Posts: 3 Newbie
    I've tried but I don't know what expression to use 
  • BalazsBaranyBalazsBarany Administrator, Moderator, Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert Posts: 955 Unicorn

    try these:
    ^ *\$ *          (if the $ is in the beginning)
     *\$ *$          (if the $ is in the end)

    ^ = start of the string
     * = optional space(s)
    \$ = quoted $ (quoting with \ to remove the special meaning
    $ = end of string

  • Alex2398Alex2398 Member Posts: 3 Newbie

    I've tried to put the regular expression you've told me but it doesn't work for me. It's probably because I'm putting it wrong.
    I attach the images of my problem to make it more visual 
    the dollar symbol does not let me convert my variable to numeric and this prevents me from working correctly with it.
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