EOF Eigenvalue Error

Hello.

I am receiving the following error when I run my script to calculate EOF's
for sea level pressure:

 Warning! LAPACK routine returned eigenvalue <= 0.
 Setting it to zero...

My code, following the examples online, is:

 lat = new((/nlat/), "float", -999)
 lat(:) = (/slp(0,:,0)/)

 wgt = sqrt(cos(lat*0.01745329))

 slp_re = slp(lat|:,lon|:,year|:)
 slp_w = slp_re

  slp_w = slp_re*conform(slp_re, wgt, 0)

  x = slp_w({15:75},{140:250},:)

  neval = 3
  eof = eofunc(x, neval, True)

I have used the same code for a different variable and received no errors,
so I am guessing that something is wrong with my SLP data. Does anyone
have any suggestions?

Thanks so much!

Cece

-- 
Cecilia Borries
Graduate Student
International Arctic Research Center
Department of Atmospheric Sciences
Teaching Assistant
Department of Physics
University of Alaska Fairbanks

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Received on Mon May 14 15:52:59 2012