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reference for previous value of an attribute

robbenrobben Member Posts: 9 Contributor II
edited November 2018 in Help
Hi all,
i have an attribute att1 and i want to build newatt by generate attribute's function expression that is the difference between the actual value of att1 and the value of att1 of the previous example (row). How can i reference the value of att1 of the previous example?
Thanks for the help

Answers

  • awchisholmawchisholm RapidMiner Certified Expert, Member Posts: 458   Unicorn
    Hello

    The Differentiate operator in the value series extension might give you something to start with

    regards

    Andrew
  • robbenrobben Member Posts: 9 Contributor II
    Thanks Andrew,
    i have to use in the formula attributes of the same example but from differents time series?
    for example i have to calculate a percent variation between more than one attribute of the preview or following rows?
    To explain, In excel being in row number 2 to on the column c (C2) i should calcutate something like = (A1-B1)/B1*100
    How to implement it in Rapidminer (using pure RM or by Series Extension)?
    Is there any user manual of series extensions?
  • awchisholmawchisholm RapidMiner Certified Expert, Member Posts: 458   Unicorn
    Hello Robben

    I get it - you could try the Lag Series operator. Here's an example
    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
    <process version="5.3.008">
      <context>
        <input/>
        <output/>
        <macros/>
      </context>
      <operator activated="true" class="process" compatibility="5.3.008" expanded="true" name="Process">
        <process expanded="true">
          <operator activated="true" class="generate_data" compatibility="5.3.008" expanded="true" height="60" name="Generate Data" width="90" x="45" y="30">
            <parameter key="number_of_attributes" value="3"/>
          </operator>
          <operator activated="true" class="generate_attributes" compatibility="5.3.008" expanded="true" height="76" name="Generate Attributes" width="90" x="179" y="30">
            <list key="function_descriptions">
              <parameter key="newAtt" value="(att1-att2)/(att3*100)"/>
            </list>
          </operator>
          <operator activated="true" class="series:lag_series" compatibility="5.3.000" expanded="true" height="76" name="Lag Series" width="90" x="313" y="30">
            <list key="attributes">
              <parameter key="newAtt" value="1"/>
            </list>
          </operator>
          <connect from_op="Generate Data" from_port="output" to_op="Generate Attributes" to_port="example set input"/>
          <connect from_op="Generate Attributes" from_port="example set output" to_op="Lag Series" to_port="example set input"/>
          <connect from_op="Lag Series" from_port="example set output" to_port="result 1"/>
          <connect from_op="Lag Series" from_port="original" to_port="result 2"/>
          <portSpacing port="source_input 1" spacing="0"/>
          <portSpacing port="sink_result 1" spacing="0"/>
          <portSpacing port="sink_result 2" spacing="0"/>
          <portSpacing port="sink_result 3" spacing="0"/>
        </process>
      </operator>
    </process>
    regards

    Andrew
  • robbenrobben Member Posts: 9 Contributor II
    Hi Andrew,
    thanks a lot. I will check your solution
    Roberto

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