How to import multiple excel files to Rapidminer [closed] - rapidminer

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I am trying to upload a folder with three excel files in it to Rapidminer at once.
What operator do I need to use to do so (without selecting each of them and use read excel operator)?

Answer 1

There is an operator Loop files, that you can use to loop through a directory of files. Inside the subprocess of this operator use the Read Excel operator. The result of this is a collection of ExampleSets. There are multiple ways to deal with a collection of ExampleSets. For concatenation (to produce single ExampleSet), use the Append operator.
Here is a sample process xml:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.3.007">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="5.3.007" expanded="true" name="Process">
<process expanded="true">
<operator activated="true" class="loop_files" compatibility="5.3.007" expanded="true" height="76" name="Loop Files" width="90" x="782" y="30">
<parameter key="directory" value="D:\xls"/>
<parameter key="filter" value="^.*\.xlsx?$"/>
<process expanded="true">
<operator activated="true" class="read_excel" compatibility="5.3.007" expanded="true" height="60" name="Read Excel" width="90" x="782" y="30">
<parameter key="excel_file" value="%{file_path}"/>
<list key="annotations"/>
<list key="data_set_meta_data_information"/>
</operator>
<connect from_op="Read Excel" from_port="output" to_port="out 1"/>
<portSpacing port="source_file object" spacing="0"/>
<portSpacing port="source_in 1" spacing="0"/>
<portSpacing port="sink_out 1" spacing="0"/>
<portSpacing port="sink_out 2" spacing="0"/>
</process>
</operator>
<operator activated="true" class="append" compatibility="5.3.007" expanded="true" height="76" name="Append" width="90" x="916" y="30"/>
<connect from_op="Loop Files" from_port="out 1" to_op="Append" to_port="example set 1"/>
<connect from_op="Append" from_port="merged set" 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>