-mail: stefano.so...@regione.marche.it
---Oo-oO
Da: Rui Barradas [ruipbarra...@sapo.pt]
Inviato: lunedì 14 settembre 2020 12.53
A: Stefano Sofia; r-help mailing list
Oggetto: Re: [R] monthly mean for each month and each year in the data
Hello,
Here are two aggregate options, the first base R only, the second one
with package zoo.
year_month <- format(df$data_POSIX, "%Y-%m")
aggregate(value ~ year_month, df, mean)# or even value ~ format(etc)
# year_monthvalue
#12019-01 6.430922
#22019-02 4.846731
#32019-
Da: Jim Lemon [drjimle...@gmail.com]
Inviato: lunedì 14 settembre 2020 12.29
A: Stefano Sofia
Cc: r-help mailing list
Oggetto: Re: [R] monthly mean for each month and each year in the data frame
Hi Stefano,
What about this?
df$months<-format
Hi Stefano,
What about this?
df$months<-format(df$data_POSIX,"%Y-%m")
snow_means<-by(df$value,df$months,mean)
Jim
On Mon, Sep 14, 2020 at 8:19 PM Stefano Sofia
wrote:
>
> Dear R-list users,
> I know that this is a trivial question, but I already wasted quite a large
> amount of time on that.
>
Dear R-list users,
I know that this is a trivial question, but I already wasted quite a large
amount of time on that.
I have a data frame with daily data of snow fall. I need to evaluate the
monthly mean for each month and each year in the data frame.
Could you help me to find an eficient way for
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