Time 
Nick 
Message 
15:07 
CandyAngel 
Super general question... can PDL::FFT help me determine if there is a 1Hz wave in 1000Hz sample data? 
15:07 
CandyAngel 
Just want to know if I am going in the right direction 
16:57 

chm joined #pdl 
17:01 
chm 
CandyAngel: Super general answer... yes. E.g., if you have 4096 data samples at 1000Hz, then the FFT will tell you the frequencies present in the data. 
17:08 
chm 
CandyAngel: There are a lot of details. Usually you'll want to make sure the data being transformed has an average value of zero 
17:08 
chm 
CandyAngel: $data = $data>avg for example 
17:10 
chm 
CandyAngel: See Spectral analysis under Discrete Fourier Transform at wikipedia 
17:11 
chm 
CandyAngel: If the data is not periodic, you'll need to apply a windowing function 
17:11 
chm 
CandyAngel: Sorry I don't have time for more nor a better reference at the moment. o/ 
17:46 
CandyAngel 
chm: Just the "yes" is enough, means I won't waste time going down the wrong path! 
17:46 
CandyAngel 
Thankies 