[ncl-talk] problems with EOF function in ncl

[Xia, Geng]

Hi all


I send out message yesterday, reporting on a problem with EOF function in ncl. Thanks to many others who helps me, It

turns out that the EOF function miscalculate the first eof mode (the mean). I did an experiment by removing the mean from the dataset, then I perform the EOF function and reconstruct the data. The result is perfect after that.


This problem won't matter if people is working with anomalies data. However, It will be an issue if people use the EOF as a filter. For example, if you use EOF to filter the high frequency noise from data set and reconstruct the filtered data. It will cause uncertainty.


So hopefully, someone who is managing the EOF coding can see this message. The function I think is responsible for the problem is eofunc_ts and eofunc.?


Best

Geng Xia

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