Re: monthly Averages

[Rob Scott <rscott@xxxxxxxxxxxxxxxxxx>]

Hi Sudheer,

I don't see an error message below, only a warning that the term "month" is 
ambiguous; in general it could mean 30 days, 31 days, or 365.2425/12 days, 
etc. Ferret is telling you that it is assuming the latter.

For instance, 2002 and 2003 were not leap years, so you might consider 
using 365/12 days, as in:
DEFINE AXIS/T="5-Jan-2002":"30-Oct-2003":`365/12`/unit=days t_month

Does that help?

Rob

At 06:28 PM 11/7/2003 +0530, you wrote:
> Dear Users
>                        Is there any way to get corret monthly averages 
> from a
> specified number of data from each month. (eg. 5th 15th and 25th
> I want to average these three values and put as monthly average.)
> I have 3 observations per month , when I tried the following way  I am
> getting an error as below. Please help me if any body have a solution .
> thanks,
> Sudheer
>
> DEFINE AXIS/T="5-Jan-2002":"30-Oct-2003":1/unit=month t_month
>  *** NOTE: /UNIT=MONTHS is ambiguous ... using 1/12 of 365.2425 days
> let mtemp=temp[GT=t_month@ave]
> let msal=psal[GT=t_month@ave]
> --
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> Dr. Sudheer Joseph
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Rob Scott
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University of Texas at Austin
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