Add or Subtract a value from a macro's value

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  rfuentealba Moderator, RapidMiner Certified Analyst, Member, University Professor Posts: 568 Unicorn

  April 2019 Solution Accepted

  Hello, @Prentice,
  
  The macro value is always a string. What you want to do is to use eval() as a method to convert it to integer.
  
  Please check this XML as an example on how to do what you want:
  
  

  <?xml version="1.0" encoding="UTF-8"?><process version="9.2.000">
    <context>
      <input/>
      <output/>
      <macros/>
    </context>
    <operator activated="true" class="process" compatibility="9.2.000" expanded="true" name="Process">
      <parameter key="logverbosity" value="init"/>
      <parameter key="random_seed" value="2001"/>
      <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="concurrency:loop" compatibility="9.2.000" expanded="true" height="82" name="Loop" width="90" x="45" y="34">
          <parameter key="number_of_iterations" value="5"/>
          <parameter key="iteration_macro" value="iterator"/>
          <parameter key="reuse_results" value="false"/>
          <parameter key="enable_parallel_execution" value="false"/>
          <process expanded="true">
            <operator activated="true" class="generate_macro" compatibility="9.2.000" expanded="true" height="82" name="Generate Macro" width="90" x="45" y="34">
              <list key="function_descriptions">
                <parameter key="value" value="eval(%{iterator}) * 50"/>
              </list>
            </operator>
            <operator activated="true" class="print_to_console" compatibility="9.2.000" expanded="true" height="82" name="Print to Console" width="90" x="179" y="34">
              <parameter key="log_value" value="%{value}"/>
            </operator>
            <connect from_port="input 1" to_op="Generate Macro" to_port="through 1"/>
            <connect from_op="Generate Macro" from_port="through 1" to_op="Print to Console" to_port="through 1"/>
            <connect from_op="Print to Console" from_port="through 1" to_port="output 1"/>
            <portSpacing port="source_input 1" spacing="0"/>
            <portSpacing port="source_input 2" spacing="0"/>
            <portSpacing port="sink_output 1" spacing="0"/>
            <portSpacing port="sink_output 2" spacing="0"/>
          </process>
        </operator>
        <connect from_op="Loop" from_port="output 1" 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>
  

  
  Hope this helps,
  
  Rodrigo.

  
  

  2