Parse Nominal ERROR

agurruchagaagurruchaga Member Posts: 11 Contributor I
edited July 2019 in Help



I am trying to parse a nominal attribute to numerical, but it seems like there is some format issue. When I use "Nominal to Numerical" Operator, I get one new column for each value of the attribute i am trying to parse.


If I use "Parse Numbers" Operator, It shows me the error "The setup does not seem to contain any obvious errors, but you should check the log messages or activate the debug mode in the settings dialog in order to get more information about this problem"


Any ideas?


Thanks in advance. 





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    agurruchagaagurruchaga Member Posts: 11 Contributor I

    I forgot to mention, my nominal attribute contains numbers and the separator is a comma. I specify this in the operator.

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    sgenzersgenzer Administrator, Moderator, Employee, RapidMiner Certified Analyst, Community Manager, Member, University Professor, PM Moderator Posts: 2,959 Community Manager

    hello @agurruchaga welcome to the community! I'd recommend posting your XML process here (see https://youtu.be/KkgB5QXWXJ8 and "Read Before Posting" on right when you reply) and attach your dataset. This way we can replicate what you're doing and help you better.




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    lionelderkrikorlionelderkrikor Moderator, RapidMiner Certified Analyst, Member Posts: 1,195 Unicorn

    Hi @agurruchaga,


    I will try to provide an answer element : 

    "When I use "Nominal to Numerical" Operator, I get one new column for each value of the attribute i am trying to parse"

    It seems that you have set, in the "Nominal to Numerical" Operator,  the parameter coding type as dummy coding, and in this case, 

    this is what is expected.

    You can instead set coding type as unique integers. In this case, your attribute values will be remplaced by numeric values.

    For example, consider that you have an attribute called Color which has as possible values :  Red 12, Blue 24 and Green 35.

    After transformation by the "Nominal to Numerical", your attribute values will be : 0, 1 and 2.


    Is it what you are looking for ?





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    agurruchagaagurruchaga Member Posts: 11 Contributor I

    Thanks both. I now see I should not use nominal to numerical, it isn't what I am looking for. The problem is "Parse Number" is throwing the exception I mentioned in my last post. I attach the process xml : 

    <?xml version="1.0" encoding="UTF-8"?><process version="8.0.001">
    <operator activated="true" class="process" compatibility="8.0.001" 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" class="set_macro" compatibility="8.0.001" expanded="true" height="68" name="Fecha de datos" width="90" x="45" y="34">
    <parameter key="macro" value="fecha_datos"/>
    <parameter key="value" value="20171231"/>
    <operator activated="true" class="subprocess" compatibility="8.0.001" expanded="true" height="82" name="Importar y tratar" width="90" x="45" y="136">
    <process expanded="true">
    <operator activated="true" class="jdbc_connectors:read_access" compatibility="8.0.001" expanded="true" height="68" name="Importar BBDD Lecturas" width="90" x="45" y="34">
    <parameter key="define_connection" value="url"/>
    <parameter key="database_system" value="UCanAccess"/>
    <parameter key="database_url" value="jdbc:ucanaccess://Z:\ITALIA\Medidas\NON ORARI\LecturasItalia.accdb;MirrorFolder=java.io.tmpdir;jackcessOpener=com.rapidminer.jdbc.AccessCryptCodecOpener"/>
    <parameter key="username" value="noUser"/>
    <parameter key="password" value="WYO/VTwMmmI1YQyZ9ygN6w=="/>
    <parameter key="define_query" value="table name"/>
    <parameter key="use_default_schema" value="true"/>
    <parameter key="table_name" value="LECT_FACTURA_DISTR"/>
    <parameter key="prepare_statement" value="false"/>
    <enumeration key="parameters"/>
    <parameter key="datamanagement" value="double_array"/>
    <parameter key="data_management" value="auto"/>
    <parameter key="database_file" value="Z:\ITALIA\Medidas\NON ORARI\LecturasItalia.accdb"/>
    <description align="center" color="transparent" colored="false" width="126"/>
    <operator activated="true" class="generate_attributes" compatibility="8.0.001" expanded="true" height="82" name="Generate Attributes" width="90" x="179" y="34">
    <list key="function_descriptions">
    <parameter key="DataMisura_num" value="concat(cut(DataMisura,6,4),cut(DataMisura,3,2),cut(DataMisura,0,2))"/>
    <parameter key="keep_all" value="true"/>
    <operator activated="true" class="parse_numbers" compatibility="8.0.001" expanded="true" height="82" name="Parse Numbers" width="90" x="313" y="34">
    <parameter key="attribute_filter_type" value="single"/>
    <parameter key="attribute" value="EaF1"/>
    <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="false"/>
    <parameter key="decimal_character" value=","/>
    <parameter key="grouped_digits" value="false"/>
    <parameter key="grouping_character" value=","/>
    <parameter key="unparsable_value_handling" value="skip attribute"/>
    <connect from_op="Importar BBDD Lecturas" from_port="output" to_op="Generate Attributes" to_port="example set input"/>
    <connect from_op="Generate Attributes" from_port="example set output" to_op="Parse Numbers" to_port="example set input"/>
    <connect from_op="Parse Numbers" from_port="example set output" 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"/>
    <operator activated="true" class="set_macro" compatibility="8.0.001" expanded="true" height="68" name="Fecha_ant" width="90" x="179" y="34">
    <parameter key="macro" value="fecha_ant"/>
    <parameter key="value" value="20171130"/>
    <operator activated="true" class="multiply" compatibility="8.0.001" expanded="true" height="103" name="Multiply" width="90" x="179" y="136"/>
    <operator activated="true" class="filter_examples" compatibility="8.0.001" expanded="true" height="103" name="Filter Examples (2)" width="90" x="447" y="340">
    <parameter key="parameter_expression" value="DataMisura_num &lt; %{fecha_datos}"/>
    <parameter key="condition_class" value="expression"/>
    <parameter key="invert_filter" value="false"/>
    <list key="filters_list">
    <parameter key="filters_entry_key" value="DataMisura.lt.12/31/2017"/>
    <parameter key="filters_logic_and" value="true"/>
    <parameter key="filters_check_metadata" value="true"/>
    <operator activated="true" class="filter_examples" compatibility="8.0.001" expanded="true" height="103" name="Filter Examples (4)" width="90" x="581" y="340">
    <parameter key="parameter_expression" value="DataMisura_num &lt; %{fecha_datos}"/>
    <parameter key="condition_class" value="custom_filters"/>
    <parameter key="invert_filter" value="false"/>
    <list key="filters_list">
    <parameter key="filters_entry_key" value="FlussoMisure.equals.PNO"/>
    <parameter key="filters_logic_and" value="true"/>
    <parameter key="filters_check_metadata" value="true"/>
    <connect from_op="Importar y tratar" from_port="out 1" to_op="Multiply" to_port="input"/>
    <connect from_op="Multiply" from_port="output 2" to_op="Filter Examples (2)" to_port="example set input"/>
    <connect from_op="Filter Examples (2)" from_port="example set output" to_op="Filter Examples (4)" to_port="example set input"/>
    <connect from_op="Filter Examples (4)" 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"/>

    The column "EaF1" contains numbers with a comma as decimal character, ie : 238,60



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    agurruchagaagurruchaga Member Posts: 11 Contributor I

    OK, it seems parse numbers operator doesn't accept blank values. I created another attribute, converting blanks to 0 and it works now(although it isn't the nicest solution IMO). Thanks for your answers.



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    Edin_KlapicEdin_Klapic Moderator, Employee, RMResearcher, Member Posts: 299 RM Data Scientist

    Hi @agurruchaga,


    For handling those blanks the parameter "unparsable value handling" is available. Assuming those blank cells represent missing entries you could set this parameter value to "replace with missing values". Within further processing you could apply the Operator Replace missing values to handle these.


    Depending on the source of your data sometimes there might be leading or trailing blanks in those cells. Those can be removed using the Operator Trim.


    Best regards,



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