Re: [ferret_users] Got "no valid data" with eofsvd

[Ansley Manke <ansley.b.manke@xxxxxxxx>]

Hi Jian,
Thank you for writing back. I had not had a chance to look at your question. The earlier version of the EOF functions (eof_space, etc) called code which allowed missing data.  The eofsvd functions work only if there is NOT missing data within the time series - that is to say, if there is data at some time at a given spatial location, then there must be data at ALL times at that location.

It sounds as if there is a bug which so that the function is not reporting back to you that missing data was found. We'll take a look at why.

Ansley

On 9/25/2013 11:30 AM, Jian Ma wrote:

Hi All,

I figured out the reason. It is because I have t step filled with missing values. While this is not any problem with the old version ferret with eof_*, it is with newer version ferret with eofsvd_*. I guess this should be reported as a bug. Currently the only solution for me may be to move the time steps and remove the missing value t steps from the data.

Tony

On Mon, Sep 23, 2013 at 5:52 PM, Jian Ma <jianma@xxxxxxxxxx> wrote:

Hi All,

I met a strange problem with eofsvd for the attached data file. It turns out to be "No valid data". Here is my commands:

yes? set d sstappcf_ma.nc 

yes? fill/l=1 sstappcf_ma

yes? let exyt=eofsvd_space(sstappcf_ma)

yes? fill/l=1 exyt

However I got good results with a data file with time coordinate dd-mm-yyyy. This file has only 1:22 in t coordinate without actual dd-mm-yyyy. Is this the reason for the problem?

Many thanks for any hint,

Tony