Problem with Fourier Transformation [SOLVED]
Hey guys,
I am trying to do a simple Fourier Transformation with Rapidminer, but I have no luck for the last 3hours. Nevermind...
Here is the problem:
I have an Excel sheet with the following columns:
x cos(x) sin(x)
0,0000 1,0000 0
0,0491 0,9988 0,049067674
0,0982 0,9952 0,09801714
...
...
1,2272 0,3369 0,941544065
1,2763 0,2903 0,956940336
1,3254 0,2430 0,970031253
1,3744 0,1951 0,98078528
1,4235 0,1467 0,98917651
1,4726 0,0980 0,995184727
1,5217 0,0491 0,998795456
1,5708 0,0000 1
...
2,9943 -0,9892 0,146730474
3,0434 -0,9952 0,09801714
3,0925 -0,9988 0,049067674
3,1416 -1,0000 2,34296E-15
3,1907 -0,9988 -0,049067674
....
6,0868 0,9808 -0,195090322
6,1359 0,9892 -0,146730474
6,1850 0,9952 -0,09801714
6,2341 0,9988 -0,049067674
6,2832 1,0000 -1,26795E-14
and there the corresponding xml file:
What is wrong wiht my process?
Regards,
pete
I am trying to do a simple Fourier Transformation with Rapidminer, but I have no luck for the last 3hours. Nevermind...
Here is the problem:
I have an Excel sheet with the following columns:
x cos(x) sin(x)
0,0000 1,0000 0
0,0491 0,9988 0,049067674
0,0982 0,9952 0,09801714
...
...
1,2272 0,3369 0,941544065
1,2763 0,2903 0,956940336
1,3254 0,2430 0,970031253
1,3744 0,1951 0,98078528
1,4235 0,1467 0,98917651
1,4726 0,0980 0,995184727
1,5217 0,0491 0,998795456
1,5708 0,0000 1
...
2,9943 -0,9892 0,146730474
3,0434 -0,9952 0,09801714
3,0925 -0,9988 0,049067674
3,1416 -1,0000 2,34296E-15
3,1907 -0,9988 -0,049067674
....
6,0868 0,9808 -0,195090322
6,1359 0,9892 -0,146730474
6,1850 0,9952 -0,09801714
6,2341 0,9988 -0,049067674
6,2832 1,0000 -1,26795E-14
and there the corresponding xml file:
Should I get normally a peak at 1hz for the sinus curve? After running the process I can the in the "DataView" 64 rows, the frequency from 0 increasing to 20.210 in 64 steps, but the fft(attribute2) still has the "?" symbol...
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="5.0">
<context>
<input/>
<output/>
<macros/>
</context>
<operator activated="true" class="process" compatibility="5.0.10" expanded="true" name="Process">
<process expanded="true" height="624" width="566">
<operator activated="true" class="read_excel" compatibility="5.0.10" expanded="true" height="60" name="Read Excel" width="90" x="45" y="30">
<parameter key="excel_file" value="C:\Dokumente und Einstellungen\pete\Desktop\test.xls"/>
<parameter key="first_row_as_names" value="false"/>
<list key="annotations"/>
<list key="data_set_meta_data_information">
<parameter key="0" value="attribute_0.true.4.regular"/>
<parameter key="1" value="attribute_1.true.4.regular"/>
<parameter key="2" value="attribute_2.true.4.regular"/>
</list>
<parameter key="attribute_names_already_defined" value="true"/>
</operator>
<operator activated="true" class="select_attributes" compatibility="5.0.10" expanded="true" height="76" name="Select Attributes" width="90" x="112" y="165">
<parameter key="attribute_filter_type" value="subset"/>
<parameter key="attribute" value="attribute_2"/>
<parameter key="attributes" value="attribute_2"/>
</operator>
<operator activated="true" class="fourier_transformation" compatibility="5.0.10" expanded="true" height="76" name="Fourier Transformation" width="90" x="313" y="120"/>
<connect from_op="Read Excel" from_port="output" to_op="Select Attributes" to_port="example set input"/>
<connect from_op="Select Attributes" from_port="example set output" to_op="Fourier Transformation" to_port="example set input"/>
<connect from_op="Fourier Transformation" 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>
What is wrong wiht my process?
Regards,
pete
