First day of each week

Oprick

Hello,
I want to do a time series forecast in data that I wish to group by week and I use PIVOT to do that. The problem is that then I lose the date type and I don't want it. Before Rapidminer I use to use Excel to transform year and week numbers in date (as first day of each week). By doing this I get a monotonic time series.

In Excel I used  to calculate the first day of each week like below, but I want to perform all data prep in RM and honestly I'm getting nowhere.

=DATE([@YEAR],1,-2)-WEEKDAY(DATE([@YEAR],1,3))+[@WEEK]*7

I bet RM can do this easily with generate attributes operator, but I'm totally stucked.

Thanks for your help,
Pedro

YYH

BTW, I am not Excel expert so I did not understand the excel formula...
If you need just a monotonic time series, try the handy operator "create example set" for date series.

<?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="utility:create_exampleset" compatibility="9.2.000" expanded="true" height="68" name="Create ExampleSet" width="90" x="715" y="34">
        <parameter key="generator_type" value="date series"/>
        <parameter key="number_of_examples" value="100"/>
        <parameter key="use_stepsize" value="true"/>
        <list key="function_descriptions"/>
        <parameter key="add_id_attribute" value="false"/>
        <list key="numeric_series_configuration"/>
        <list key="date_series_configuration">
          <parameter key="value" value="2009-01-01 00:00:00."/>
        </list>
        <list key="date_series_configuration (interval)">
          <parameter key="time" value="2009-01-01 00:00:00.1.day"/>
        </list>
        <parameter key="date_format" value="yyyy-MM-dd HH:mm:ss"/>
        <parameter key="time_zone" value="SYSTEM"/>
        <parameter key="column_separator" value=","/>
        <parameter key="parse_all_as_nominal" value="false"/>
        <parameter key="decimal_point_character" value="."/>
        <parameter key="trim_attribute_names" value="true"/>
      </operator>
      <connect from_op="Create ExampleSet" from_port="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>