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Rename many columns

choose_usernamechoose_username Member Posts: 33 Contributor II
in Help
Hi there,

i wanted to rename a column with the Operator Rename. The Problem is that i have to rename 31 columns. As far as i see i do need to use 31 Rename-Operators? My Question is: Is there a way to rename all 31 columns with 1 operator?


thanks in advance

user

Answers

  • wesselwessel Member Posts: 537 Maven
    Use the Loop Attributes operator?

  • IngoRMIngoRM Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Community Manager, RMResearcher, Member, University Professor Posts: 1,751 RM Founder
    Hi,

    maybe the operators "Rename by Replacing" or "Rename by Generic Names" can also be helpful. If you want to use specific names, looping could indeed be the best option - you could even take the old and new names from another example set...

    Cheers,
    Ingo
  • choose_usernamechoose_username Member Posts: 33 Contributor II
    Hello,

    the approach with the Loop sounds interessting. By trying it i found out that it is neccessary to make use of macros. Is there a tutorial or example how to do this in RM?


    (btw its a great product with great support)


    Greetings

    User
  • IngoRMIngoRM Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Community Manager, RMResearcher, Member, University Professor Posts: 1,751 RM Founder
    Hi,

    did you try our new Community Extension? Just download and install it from our update- and installation server via the Help menu of RapidMiner. You can search for processes containing the word "Loop" or "Macro" and you will see several examples of processes containing operators making use of them.

    Cheers,
    Ingo
  • awchisholmawchisholm RapidMiner Certified Expert, Member Posts: 458 Unicorn
    If you want a quick and dirty hack, I successfully used the de-obfuscate operator to rename columns. Provide an obfuscation map file containing a row for each attribute you want to rename in the following form: 

    oldname<tab>newname
    The tab is important; spaces cause an error.

    Ugly but effective.

    regards,

    Andrew
  • IngoRMIngoRM Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Community Manager, RMResearcher, Member, University Professor Posts: 1,751 RM Founder
    Nice one  ;)

    Cheers,
    Ingo
  • choose_usernamechoose_username Member Posts: 33 Contributor II
    thx for the tip. i will give it a try : )

    greetings User
  • wesselwessel Member Posts: 537 Maven
    How to convert all attributes to lower-case?
  • choose_usernamechoose_username Member Posts: 33 Contributor II
    well i simply use the Rename Operator. But maybe there s a solution tryin "Rename by Replacing" in combination with an regular expression like  [A-Z]  ->  [a-z] and a loop or smthing

    greetings

    User
  • wesselwessel Member Posts: 537 Maven
    hmm :P

    Then you need to type 26 replacements..
  • IngoRMIngoRM Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Community Manager, RMResearcher, Member, University Professor Posts: 1,751 RM Founder
    Hi,

    this is easily possible with a short script. You can find an example process with our Community Extension for RapidMiner. Just download the extension, show the corresponding view and search for the process "Transform Attribute Names to lower Case (Script)". You can then simply download the process and run it directly in your client.

    Cheers,
    Ingo
  • wesselwessel Member Posts: 537 Maven
    awchisholm wrote:

    If you want a quick and dirty hack, I successfully used the de-obfuscate operator to rename columns. Provide an obfuscation map file containing a row for each attribute you want to rename in the following form: 

    oldname<tab>newname
    The tab is important; spaces cause an error.

    Ugly but effective.

    regards,

    Andrew
    How does this work?
  • awchisholmawchisholm RapidMiner Certified Expert, Member Posts: 458 Unicorn
    Here's an example process 

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <process version="5.0">
      <context>
        <input/>
        <output/>
        <macros/>
      </context>
      <operator activated="true" class="process" expanded="true" name="Process">
        <process expanded="true" height="161" width="480">
          <operator activated="true" class="generate_data" expanded="true" height="60" name="Generate Data" width="90" x="112" y="75"/>
          <operator activated="true" class="de_obfuscate" expanded="true" height="76" name="rename" width="90" x="380" y="75">
            <parameter key="obfuscation_map_file" value="c:\temp\att.txt"/>
          </operator>
          <connect from_op="Generate Data" from_port="output" to_op="rename" to_port="example set input"/>
          <connect from_op="rename" 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"/>
        </process>
      </operator>
    </process>


    The file referred to is here 

    att1	apple
    att2	banana
    att3	pear
    att4	grape
    att5	orange
    Ugly but effective

    Andrew
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