HI,
If you want to do daily mean, sum etc.
you could try ?tapply(), ?ave(), ?aggregate(), ?ddply() etc.
For e.g.
ave(myframe2$Speed,as.Date(myframe2$myframestime),FUN=sum)
#[1] 4 4 4 12 12 12
tapply(myframe2$Speed,as.Date(myframe2$myframestime),FUN=mean)
#2012-09-24 2012-09-25
# 1.333333 4.000000
It is better to show the complex data as an example using dput()
A.K.
----- Original Message -----
From: Tagmarie <ramga...@gmx.net>
To: r-help@r-project.org
Cc:
Sent: Tuesday, November 27, 2012 9:02 AM
Subject: [R] loop with date
Hello,
I tried to construct my very first loop today and completly failed :-(
Maybe someone can help me?
I have a dataframe somewhat like this one:
myframe <- data.frame (Timestamp=c("24.09.2012 09:00", "24.09.2012 10:00",
"24.09.2012 11:00",
"25.09.2012 09:00", "25.09.2012 10:00",
"25.09.2012 11:00"),
Speed=c(1,1,2,5,1,6))
myframestime <- as.POSIXct (strptime(as.character(myframe$Timestamp),
"%d.%m.%Y %H:%M"), tz="GMT")
myframe2 <- cbind (myframe,myframestime)
myframe2$Timestamp <- NULL
myframe2
I want to construct a loop for every day, i.e. for each day I want to do
some calculations.
(I know in the example it would be easier to do it differently, my real data
are little more complex).
And BTW: Thanks for helping me earlier today with that other problem :-)
--
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