Hello,
I have a data frame 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"), Hunger=c(1,1,1,2,2,1) )
myframestime <- as.POSIXct (strptime(as.character(myframe$Timestamp),
"%d.%m.%Y %H:%M"), tz="GMT")
myframe2 <- cbind (myframe,myframestime)
myframe2$Timestamp <- NULL
myframe2
Now I want to get the sum of "Hunger" for each day. In the end I want
something which looks like the following dataframe:
myoutcome <- data.frame(Timestamp=c("24.09.2012", "25.09.2012"),
sumHunger=c(3, 5))
Does anyone know how to do that?
That would be very helpful and to all people who are willing to help me:
Thank you in advance!
Best regards,
Tagmarie
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