Tena koe Dominique
?tapply
?aggregate
For example,
dayMn <- tapply(yourData$runoff, yourData[,c('year','month','day')], mean,
na.rm=TRUE)
yearMed <- tapply(dayMn$runoff, dayMn$year, median, na.rm=TRUE)
with(yearMed, plot(year, runoff))
I have not tested the above and since I can never remember exact syntax or
output I would not be surprised if the above needed tweaking.
HTH ....
Peter Alspach
> -----Original Message-----
> From: [email protected] [mailto:r-help-bounces@r-
> project.org] On Behalf Of dominique
> Sent: Thursday, 24 March 2011 9:14 a.m.
> To: [email protected]
> Subject: [R] mean of runoff for several years
>
> Hello everyone
> I have a dataframe with 4 colums (year, month, day, runoff) for 1993-
> 2009.
> Now I like to calculate the average runoff for each day. Finally I like
> to
> plot the median runoff for all this years.
> I tried with some loops, but it didn't work. Do you have any Tips for
> my
> problem?
> Any help is greatly appreciated! Thank you very much.
> Dominique
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/mean-of-
> runoff-for-several-years-tp3400541p3400541.html
> Sent from the R help mailing list archive at Nabble.com.
>
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