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Hi, i also want to do Fourier Transform on vibration data (time series), but also have no idea, how the output is to be interpretet. I also get dim_1 (real and imaginary value type) and dim_2 (only real value). There is no labeling on the axis and the extension documentation does not give any hint on this.
Did anyone perform a succesfull fourier transform and can help us?
hello @renew - the Time Series Extension is undergoing a complete rebuild under the excellent leadership of @tftemme and is currently in alpha testing. Please see recent blog post here: http://community.rapidminer.com/t5/Community-Blog/Time-Series-Extension-Release-of-the-Alpha-Version-0-1-2/ba-p/41717 Perhaps you should give this a try?
Scott
Hey @renew and @ssudeesh2000. As Scott is correctly pointing out we are currently developing the rebuild of the Time Series Extension. Unfortunately a Fast Fourier Transformation is not yet in the new Extension. But it is definetly a must have and on the list for the next versions.
For the old Series Extension, the _dim_1 Attribute is the Amplitude of the Fourier coefficients and probably the Attribute you want to have. Unfortunately I am not sure why you have also imaginary value type (although @prendoso is correct that a correct fourier transformation has imaginary coefficients), cause I can't reproduce it with my current setup here. The _dim_2 Attribute is the phase of the corresponding coefficient. (The values should vary in a range of pi (so for example for me between 0 and 3.141)).
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