[ncl-talk] Options in eofunc

[Yohei Takano]

Dear NCL users,

  I have a question on "eofunc".
The NCL website tells me that eofunc has three input (options)

  function eofunc(
		data    : numeric,
		neval   : integer,
		optEOF  : logical
	        )

  and I understand that you can set options in "optEOF (logical)" such as
using correlation matrix and setting the % of non-missing points.

  However, I found a couple of examples using "eofunc" like below,

   $ evec= eofunc(ptw,neval,80.)
  (Example 7 on the NCL website)

  and I am not 100% sure what the third option (80.) means in this case.
I thought the third option supposed to be logical but apparently some
of the example contains a number. I thought this is the same as setting 
the % of non-missing points because when I compared the two methods 
(i.e. one with setting the optEOF and the other just setting values like 
in Example 7), I see the same results (EOF) but am I correct on this?

  If anyone can clarify on this that will be great.
Thank you very much in advance.

  Sincerely,

Yohei Takano

-- 
Yohei Takano Ph.D
Max Planck Institute for Meteorology
Bundesstraße 53, Room 207
20146 Hamburg, Germany
Tel: +49 (0)40 41173 - 150
Email: yohei.takano at mpimet.mpg.de