[ncl-talk] How to read / get access to the eofunc source code?

[Dennis Shea]

[1] Generally, anomalies are input to the EOF function: eofunc
     Otherwise the EOF's will contain the information from the annual
cycle.

[2]
Covariance is a measure of *magnitude* of variability between two
variables. Most commonly, the same variable (say temperature) is observed
at stations or grid points. Then the two variables are temperatures at
different locations.

[3] Correlation is a measure of the variability but it has been *scaled* by
each variable's local  standard deviation.

[4] EOFs are typically calculated using covariance. The correlation matrix
is used *patterns* are important.

[5] NCL uses a modified version of the SCRIPPS code at:
http://meteora.ucsd.edu/~pierce/eof/eofs.html

Good luck

On Thu, Apr 28, 2016 at 11:02 AM, Erik J. Schaffernicht <
eschaffe at uni-koeln.de> wrote:

> I like to read how   eofunc  works.  How can I access its source code?
>
> It is due to that I am not sure if I have preprocessed my data right to
> enter them into eofunc and I haven't yet fully understood what the
> covariance  versus  correlation  switch    means to my data, concerning the
> way I have to input it and to the results I got out of the EOF and my data.
> If output patterns are different, then I like to interpret them right and
> understand what I actually get and if that is what I think I get.
>
> Furthermore,  how this switch allows or disallows for what kind of
> combined data input (SLP with PR) I can process in which way with EOF.
> Do I have to normalize or standardize my data input from different
> variables or can I rely on eofunc of NCL doing it for me properly?
>
>
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