High pass filter

From: Tu (jienyi AT gate.sinica.edu.tw)
Date: Mon Aug 08 2005 - 00:38:17 MDT

  I am trying to filter out the Low-frequency signal and using "wgt_runave" to compute this with lancos weights
  But the result seem has exhibits artifical oscillation.

  if anyone can tell me how to filter out it in using NCL build-in function
  or has any other method for the High-pass filter



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