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Re: 30 day months in calendar



I am sure there is an "official" ferret way, however, my method has been to use
the /npoints axis definition, with reasonable beginning and end points. For
example, if a model data set is for 1980-1998 with monthly mean values I define
the time axis as:

yes? define axis/t="16-jan-1980:12":"16-dec-1998:12"/np=228 taxis

Where 228=19 years*12 months. For most purposes this works perfectly. The
ferret date is never more than about 1 day from the true center of the month
(less than 1 day except for February). The first year looks like:

           1>  16-JAN-1980 12:00:00  730.467        692532
           2>  15-FEB-1980 22:28:01  730.467        693262.4
           3>  17-MAR-1980 08:56:02  730.467        693993
           4>  16-APR-1980 19:24:03  730.467        694723.4
           5>  17-MAY-1980 05:52:04  730.467        695453.9
           6>  16-JUN-1980 16:20:05  730.467        696184.3
           7>  17-JUL-1980 02:48:06  730.467        696914.8
           8>  16-AUG-1980 13:16:07  730.467        697645.2
           9>  15-SEP-1980 23:44:08  730.467        698375.8
          10>  16-OCT-1980 10:12:09  730.467        699106.2
          11>  15-NOV-1980 20:40:10  730.467        699836.7
          12>  16-DEC-1980 07:08:11  730.467        700567.1

Hope this helps, Mark Verschell


On Jan 19,  4:56pm, a.larkin@ic.ac.uk wrote:
> Subject: 30 day months in calendar
> Hello, I hope this isn't a stupid question...
>
> I plot data from the UK met offices Unified Model (UM) using Ferret, and the
data from the UM has 360 days in a year, with each month having 30 days. My
problem is that Ferret has the correct number of days, hence my calendar gets
out of sink. I know I can do 'cancel mode calendar' to see my data in days, but
I really need to plot time series that have the time axis in months. How can I
make Ferret do this?
> Alice Larkin
>-- End of excerpt from a.larkin@ic.ac.uk




-- 
 Mark Verschell                     NASA/Goddard Space Flight Center
 verschell@neptune.gsfc.nasa.gov    Code 970/Lab. for Hydrospheric Proc.
 301-614-5669  Fax: 301-614-5666    Greenbelt, MD 20771

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