From ngalbraith@whoi.edu Tue, 05 Dec 2000 17:36:22 -0500
Date: Tue, 05 Dec 2000 17:36:22 -0500
From: NGalbraith ngalbraith@whoi.edu
Subject: [Sea-mat] Mailing List

We've moved the Sea-Mat mailing list to the Woods Hole Oceanographic 
Institution "mailman" system. The list has been inoperable for a few
months due to USGS network constraints.  

If you need to update your email address, or if you know of someone 
who has been unable to subscribe to the Sea-mat list, corrections can 
be made at 

   http://www.whoi.edu/mailman/listinfo/sea-mat or via email.

If you have trouble using the web interface, you can also make such 
changes via email - send a message to:

    sea-mat-request@whoi.edu

with the text "help" in the subject or body, and you will be emailed
instructions. 

We'll be archiving messages, details are also at the URL above.
 
"The SEA-MAT mailing list is for the oceanographic Matlab community 
to use however they see fit. If you can't find the m-file you need, 
ask the group! Or tell others what you working on to cut down on 
parallel development efforts."  


*********************************************************************
* Nan Galbraith                         MS 29                       *
* Woods Hole Oceanographic Institution  Woods Hole, MA 02543        *
*********************************************************************




From rich@ocgy.ubc.ca Thu, 7 Dec 2000 11:09:58 -0800 (PST)
Date: Thu, 7 Dec 2000 11:09:58 -0800 (PST)
From: Rich Pawlowicz rich@ocgy.ubc.ca
Subject: [Sea-mat] Tidal analysis

In celebration of The Return of the SEA-MAT mailing list...

  
      T_Tide: Harmonic analysis for tidal time series


 T_Tide is an complete implementation of the classical method of harmonic 
 analysis for real or complex time series by least squares fitting of 
 known sinusoids. Inference, astronomical arguments, and nodal corrections
 are available. Although the algorithm basically follows the sequence used 
 in the IOS tidal analysis package, it has been completely re-written in 
 vectorized Matlab using complex algebra, and also includes two 
 different methods of computing confidence intervals.

 v0.97 - Now available as a link through SEA-MAT.


Rich Pawlowicz
Bob Beardsley
Steve Lentz

-- 
Rich Pawlowicz            
Oceanography, Dept. of Earth and Ocean Sciences, Univ. of British Columbia, 
6270 University Blvd., Vancouver, B.C. CANADA V6T 1Z4
email: rich@ocgy.ubc.ca       ph: (604) 822-1356         fax: (604) 822-6091





From d.goring@niwa.cri.nz Thu, 14 Dec 2000 19:43:25 +1300
Date: Thu, 14 Dec 2000 19:43:25 +1300
From: Derek Goring d.goring@niwa.cri.nz
Subject: [Sea-mat] IMF's and Hilbert spectrum

Hi there

Has anyone out there tried using IMF's (intrinsic mode functions) 
and the Hilbert spectrum to analyse seiche data as per Huang et al 
in JPO, 30: 2001-2012?

IMF's seem to work very well once you figure out how to deal with 
end effects of the cubic spline (I simply use a best fit linear curve 
from the penultimate knot to the ends).  My problem is how to deal 
with negative frequencies arising from:

h=hilbert(imf);
phi=unwrap(angle(h));
w=diff(phi)/dt;

Has anyone figured this one out?

 
Derek Goring
Principal Scientist
Coastal and Freshwater Hydrodynamics
NIWA
P O Box 8602
Christchurch
NEW ZEALAND
Ph 64 3 343 7868
Fax 64 3 348 5548
http://www.niwa.cri.nz




