convert values

bookitsa

Hello! I have a dataset where the content  of an attribute has only 2 values: 2 and 4. I want to convert these 2 values in yes and no. Note that this attribute has the role label as well.Thank you for your help!

varunm1

Hi @bookitsa

Once you upload the data set connect "Replace" operator and select attribute filter type single and select the relevant attribute. Now you need to check include special attributes. Then in replace what give 2 and replace by yes.  Then you can connect one more replace attribute after this and change 4 to no. You can find sample code below. This works for the present requirement, there might be some other methods as well.

<?xml version="1.0" encoding="UTF-8"?><process version="9.1.000">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="9.1.000" 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="generate_data" compatibility="9.1.000" expanded="true" height="68" name="Generate Data" width="90" x="112" y="187">
        <parameter key="target_function" value="sinus classification"/>
        <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="replace" compatibility="9.1.000" expanded="true" height="82" name="Replace" width="90" x="380" y="187">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="label"/>
        <parameter key="attributes" value=""/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="true"/>
        <parameter key="replace_what" value="positive"/>
        <parameter key="replace_by" value="1"/>
      </operator>
      <operator activated="true" class="replace" compatibility="9.1.000" expanded="true" height="82" name="Replace (2)" width="90" x="514" y="187">
        <parameter key="attribute_filter_type" value="single"/>
        <parameter key="attribute" value="label"/>
        <parameter key="attributes" value=""/>
        <parameter key="use_except_expression" value="false"/>
        <parameter key="value_type" value="nominal"/>
        <parameter key="use_value_type_exception" value="false"/>
        <parameter key="except_value_type" value="file_path"/>
        <parameter key="block_type" value="single_value"/>
        <parameter key="use_block_type_exception" value="false"/>
        <parameter key="except_block_type" value="single_value"/>
        <parameter key="invert_selection" value="false"/>
        <parameter key="include_special_attributes" value="true"/>
        <parameter key="replace_what" value="negative"/>
        <parameter key="replace_by" value="0"/>
      </operator>
      <connect from_op="Generate Data" from_port="output" to_op="Replace" to_port="example set input"/>
      <connect from_op="Replace" from_port="example set output" to_op="Replace (2)" to_port="example set input"/>
      <connect from_op="Replace (2)" 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>

Thanks,
Varun

tftemme

Hi @bookitsa,

You can also use the Generate Attribute operator. For the attribute name you choose the old attribute name (it will be overwritten with the new values. For the function expression, you use:

if ([attribute name] == 2, "yes", "no")

Of course you have to replace [attribute name] with your own attribute name (and maybe change "yes" and "no" if the 4 should be converted to a "yes"

Best regards,
Fabian

Telcontar120

You can also use the Nominal to BInominal Operator if you are trying to make it specifically a binominal type attribute (which is often the case for labels).

bookitsa

Thank you all for your responses! The one that solved my problem was from @varunm1! Thank you again all of you!!