Can i recall an atrribute with a string an a macro in a function expression?

Plättenzwerg

I have multiple atrributes in pairs. The actual value and the target Value.
They are named Mi and SET Mi. 
I want to create the differenz between them. 
The plan was to loop(attribute) the operator genrate Attribute with the function expression %{loop_attribute} - ["SET "#loop_attribute ].
I tried diffrent functions like concat(), attribute() and the help of a second macro, but i cannot find the right expression.

Thanks for your help

Hermann

MartinLiebig

Hi Hermann,

attached is a process showing this. The Generate Attribute equation I use is:

eval(%{loop_attribute})-attribute("SET "+%{loop_attribute})

I think you can adapt it from here?

Best,

Martin

<?xml version="1.0" encoding="UTF-8"?><process version="9.8.001">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.8.001" 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" breakpoints="after" class="subprocess" compatibility="9.8.001" expanded="true" height="82" name="Subprocess" width="90" x="45" y="85">
        <process expanded="true">
          <operator activated="true" class="generate_data" compatibility="9.8.001" expanded="true" height="68" name="Generate Data" width="90" x="45" y="34">
            <parameter key="target_function" value="random"/>
            <parameter key="number_examples" value="100"/>
            <parameter key="number_of_attributes" value="5"/>
            <parameter key="attributes_lower_bound" value="-10.0"/>
            <parameter key="attributes_upper_bound" value="10.0"/>
            <parameter key="gaussian_standard_deviation" value="10.0"/>
            <parameter key="largest_radius" value="10.0"/>
            <parameter key="use_local_random_seed" value="false"/>
            <parameter key="local_random_seed" value="1992"/>
            <parameter key="datamanagement" value="double_array"/>
            <parameter key="data_management" value="auto"/>
          </operator>
          <operator activated="true" class="generate_id" compatibility="9.8.001" expanded="true" height="82" name="Generate ID" width="90" x="179" y="34">
            <parameter key="create_nominal_ids" value="false"/>
            <parameter key="offset" value="0"/>
          </operator>
          <operator activated="true" class="generate_data" compatibility="9.8.001" expanded="true" height="68" name="Generate Data (2)" width="90" x="45" y="238">
            <parameter key="target_function" value="random"/>
            <parameter key="number_examples" value="100"/>
            <parameter key="number_of_attributes" value="5"/>
            <parameter key="attributes_lower_bound" value="-10.0"/>
            <parameter key="attributes_upper_bound" value="10.0"/>
            <parameter key="gaussian_standard_deviation" value="10.0"/>
            <parameter key="largest_radius" value="10.0"/>
            <parameter key="use_local_random_seed" value="false"/>
            <parameter key="local_random_seed" value="1992"/>
            <parameter key="datamanagement" value="double_array"/>
            <parameter key="data_management" value="auto"/>
          </operator>
          <operator activated="true" class="generate_id" compatibility="9.8.001" expanded="true" height="82" name="Generate ID (2)" width="90" x="179" y="238">
            <parameter key="create_nominal_ids" value="false"/>
            <parameter key="offset" value="0"/>
          </operator>
          <operator activated="true" class="rename_by_replacing" compatibility="9.8.001" expanded="true" height="82" name="Rename by Replacing" width="90" x="313" y="238">
            <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="attribute_value"/>
            <parameter key="use_value_type_exception" value="false"/>
            <parameter key="except_value_type" value="time"/>
            <parameter key="block_type" value="attribute_block"/>
            <parameter key="use_block_type_exception" value="false"/>
            <parameter key="except_block_type" value="value_matrix_row_start"/>
            <parameter key="invert_selection" value="false"/>
            <parameter key="include_special_attributes" value="false"/>
            <parameter key="replace_what" value="(.+)"/>
            <parameter key="replace_by" value="SET $1"/>
          </operator>
          <operator activated="true" class="concurrency:join" compatibility="9.8.001" expanded="true" height="82" name="Join" width="90" x="447" y="85">
            <parameter key="remove_double_attributes" value="true"/>
            <parameter key="join_type" value="inner"/>
            <parameter key="use_id_attribute_as_key" value="false"/>
            <list key="key_attributes">
              <parameter key="id" value="id"/>
            </list>
            <parameter key="keep_both_join_attributes" value="false"/>
          </operator>
          <connect from_op="Generate Data" from_port="output" to_op="Generate ID" to_port="example set input"/>
          <connect from_op="Generate ID" from_port="example set output" to_op="Join" to_port="left"/>
          <connect from_op="Generate Data (2)" from_port="output" to_op="Generate ID (2)" to_port="example set input"/>
          <connect from_op="Generate ID (2)" from_port="example set output" to_op="Rename by Replacing" to_port="example set input"/>
          <connect from_op="Rename by Replacing" from_port="example set output" to_op="Join" to_port="right"/>
          <connect from_op="Join" from_port="join" to_port="out 1"/>
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
          <portSpacing port="sink_out 2" spacing="0"/>
        </process>
        <description align="center" color="transparent" colored="false" width="126">Generate an example data set</description>
      </operator>
      <operator activated="true" class="concurrency:loop_attributes" compatibility="9.8.001" expanded="true" height="82" name="Loop Attributes" width="90" x="246" y="85">
        <parameter key="attribute_filter_type" value="regular_expression"/>
        <parameter key="attribute" value=""/>
        <parameter key="attributes" value=""/>
        <parameter key="regular_expression" value="att.+"/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="attribute_value"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="time"/>
        <parameter key="block_type" value="attribute_block"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="value_matrix_row_start"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="false"/>
        <parameter key="attribute_name_macro" value="loop_attribute"/>
        <parameter key="reuse_results" value="true"/>
        <parameter key="enable_parallel_execution" value="true"/>
        <process expanded="true">
          <operator activated="true" class="generate_attributes" compatibility="9.8.001" expanded="true" height="82" name="Generate Attributes" width="90" x="112" y="34">
            <list key="function_descriptions">
              <parameter key="Delta_%{loop_attribute}" value="eval(%{loop_attribute})-attribute(&quot;SET &quot;+%{loop_attribute})"/>
            </list>
            <parameter key="keep_all" value="true"/>
          </operator>
          <connect from_port="input 1" to_op="Generate Attributes" to_port="example set input"/>
          <connect from_op="Generate Attributes" from_port="example set output" 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="Subprocess" from_port="out 1" to_op="Loop Attributes" to_port="input 1"/>
      <connect from_op="Loop Attributes" 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>