Re: [amibroker] Help with Tomasz's Example on FFT

["Tomasz Janeczko" <groups@xxxxxxxxxxxxx>]

Hello,

It plots the dominant cycle itself
- it plots ONE (co)sine wave with phase/frequency of selected bar (sbar).

Best regards,
Tomasz Janeczko
amibroker.com
  ----- Original Message ----- 
  From: Paul Ho 
  To: amibroker@xxxxxxxxxxxxxxx 
  Sent: Wednesday, November 01, 2006 5:31 AM
  Subject: [amibroker] Help with Tomasz's Example on FFT


  Hello,

  I've been going over Tomasz's example on FFT that he published on with the release of 4.87 beta.

  So far so good with the exception of the last plot statement

   

  Plot( cos( phase[ sbar * 2 ] + (sbar) * x1 * 2 * 3.1415926 / Len ), 

  " dominant cycle "+ Len/(sbar) + "(" + sbar + " bin) bars", colorBlue, styleOwnScale ); 

   

  It seems that this statement is plotting the weighting factor of the fourier transform

   

  Wk = cos(2ðk/N + ö)

  Where ö is the phase angle and k is the no of harmonics in the series.

  If this is the case, how is it related to the dominant cycle.

   

  Any explanations will be greatly appreacriated.

   

  Thanks

  Paul.

   
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