I am trying to create a calculated attribute that is the difference between two integer attributes, namely "15hr" and "14hr". I have removed non-zero values and this problem still persists. Here is my process:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="6.4.000">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="6.4.000" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="retrieve" compatibility="6.4.000" expanded="true" height="60" name="Retrieve TwentyFourteen" width="90" x="45" y="30">
<parameter key="repository_entry" value="//NewLocalRepository/TwentyFourteen"/>
</operator>
<operator activated="true" class="retrieve" compatibility="6.4.000" expanded="true" height="60" name="Retrieve TwentyFifteen" width="90" x="45" y="75">
<parameter key="repository_entry" value="//NewLocalRepository/TwentyFifteen"/>
</operator>
<operator activated="true" class="join" compatibility="6.4.000" expanded="true" height="76" name="Join" width="90" x="179" y="30">
<parameter key="remove_double_attributes" value="false"/>
<parameter key="join_type" value="right"/>
<parameter key="use_id_attribute_as_key" value="false"/>
<list key="key_attributes">
<parameter key="Team" value="Team"/>
</list>
</operator>
<operator activated="true" class="select_attributes" compatibility="6.4.000" expanded="true" height="76" name="Select Attributes" width="90" x="313" y="30">
<parameter key="attribute_filter_type" value="subset"/>
<parameter key="attributes" value="G|G_from_ES2|HR|HR_from_ES2|Team|W-L|W-L_from_ES2"/>
</operator>
<operator activated="true" class="rename" compatibility="6.4.000" expanded="true" height="76" name="Rename" width="90" x="447" y="30">
<parameter key="old_name" value="G"/>
<parameter key="new_name" value="14g"/>
<list key="rename_additional_attributes">
<parameter key="G_from_ES2" value="15g"/>
<parameter key="HR" value="14hr"/>
<parameter key="HR_from_ES2" value="15hr"/>
<parameter key="W-L" value="14 W-L"/>
<parameter key="W-L_from_ES2" value="15 W-L"/>
</list>
</operator>
<operator activated="true" breakpoints="after" class="filter_examples" compatibility="6.4.000" expanded="true" height="94" name="Filter Examples" width="90" x="313" y="165">
<list key="filters_list">
<parameter key="filters_entry_key" value="14hr.is_not_missing."/>
<parameter key="filters_entry_key" value="15hr.is_not_missing."/>
</list>
</operator>
<operator activated="true" class="generate_attributes" compatibility="6.4.000" expanded="true" height="76" name="Generate Attributes" width="90" x="514" y="165">
<list key="function_descriptions">
<parameter key="HR_D" value="15hr-14hr"/>
</list>
</operator>
<connect from_op="Retrieve TwentyFourteen" from_port="output" to_op="Join" to_port="left"/>
<connect from_op="Retrieve TwentyFifteen" from_port="output" to_op="Join" to_port="right"/>
<connect from_op="Join" from_port="join" to_op="Select Attributes" to_port="example set input"/>
<connect from_op="Select Attributes" from_port="example set output" to_op="Rename" to_port="example set input"/>
<connect from_op="Rename" from_port="example set output" to_op="Filter Examples" to_port="example set input"/>
<connect from_op="Filter Examples" from_port="example set output" to_op="Generate Attributes" to_port="example set input"/>
<connect from_op="Generate Attributes" 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>
