How to look ahead or back at the records relative to your current record

mazda

I like to set values for my newly created attribute based on a previous value of another attribute (previous record of another attribute).  To do this I need to look back or point to another record relative to where I am.  Any idea how I could do this in RapidMiner?

Greatly appreciate any ideas you have.

Thanks,
Mazda

MariusHelf

Maybe the Windowing operator of the Value Series extension could be useful for you.

Otherwise you could try a combination of Loop Examples and Generate Macro as in the process below.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.2.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="5.2.001" expanded="true" name="Process">
    <process expanded="true" height="541" width="969">
      <operator activated="true" class="generate_data" compatibility="5.2.001" expanded="true" height="60" name="Generate Data" width="90" x="112" y="30"/>
      <operator activated="true" class="loop_examples" compatibility="5.2.001" expanded="true" height="76" name="Loop Examples" width="90" x="313" y="30">
        <process expanded="true" height="541" width="969">
          <operator activated="true" class="generate_macro" compatibility="5.2.001" expanded="true" height="76" name="Generate Macro" width="90" x="45" y="30">
            <list key="function_descriptions">
              <parameter key="ex_minus_1" value="%{example}-1"/>
            </list>
          </operator>
          <operator activated="true" class="handle_exception" compatibility="5.2.001" expanded="true" height="76" name="Handle Exception" width="90" x="313" y="30">
            <process expanded="true" height="541" width="459">
              <operator activated="true" class="extract_macro" compatibility="5.2.001" expanded="true" height="60" name="Extract Macro" width="90" x="112" y="30">
                <parameter key="macro" value="value"/>
                <parameter key="macro_type" value="data_value"/>
                <parameter key="attribute_name" value="att1"/>
                <parameter key="example_index" value="%{ex_minus_1}"/>
              </operator>
              <operator activated="true" class="print_to_console" compatibility="5.2.001" expanded="true" height="76" name="Print to Console" width="90" x="313" y="30">
                <parameter key="log_value" value="%{value}"/>
              </operator>
              <connect from_port="in 1" to_op="Extract Macro" to_port="example set"/>
              <connect from_op="Extract Macro" from_port="example set" to_op="Print to Console" to_port="through 1"/>
              <connect from_op="Print to Console" from_port="through 1" to_port="out 1"/>
              <portSpacing port="source_in 1" spacing="0"/>
              <portSpacing port="source_in 2" spacing="0"/>
              <portSpacing port="sink_out 1" spacing="0"/>
              <portSpacing port="sink_out 2" spacing="0"/>
            </process>
            <process expanded="true" height="541" width="459">
              <connect from_port="in 1" to_port="out 1"/>
              <portSpacing port="source_in 1" spacing="0"/>
              <portSpacing port="source_in 2" spacing="0"/>
              <portSpacing port="sink_out 1" spacing="0"/>
              <portSpacing port="sink_out 2" spacing="0"/>
            </process>
          </operator>
          <connect from_port="example set" to_op="Generate Macro" to_port="through 1"/>
          <connect from_op="Generate Macro" from_port="through 1" to_op="Handle Exception" to_port="in 1"/>
          <connect from_op="Handle Exception" from_port="out 1" to_port="example set"/>
          <portSpacing port="source_example set" spacing="0"/>
          <portSpacing port="sink_example set" spacing="0"/>
          <portSpacing port="sink_output 1" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Generate Data" from_port="output" to_op="Loop Examples" to_port="example set"/>
      <connect from_op="Loop Examples" from_port="example set" 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>