Re: how to weight data with the square root of density

Hi,
I think example 1 will deal with your problem on how to weight data,
http://www.ncl.ucar.edu/Applications/eof.shtml.
For example:
; =================================================================
; create weights: sqrt(cos(lat)) [or sqrt(gw) ]
; =================================================================
  rad = 4.*atan(1.)/180.
  clat = f->lat
  clat = sqrt( cos(rad*clat) )

; =================================================================
; weight all observations
; =================================================================
  wSLP = SLP ; copy meta data
  wSLP = SLP*conform(SLP, clat, 1)
  wSLP@long_name = "Wgt: "+wSLP@long_name
; =================================================================

I hope this helps.
Tingting

-- 
Tingting Fan
grad student visitor
NCAR/CGD/CAS
tel:303-497-1745
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