Dear knowing people,
I have a data frame like this.
exdatframe <- data.frame(Name=c("Ernie","Ernie","Ernie",
"CookieMonster","CookieMonster","CookieMonster"),
recordedTime=as.POSIXct(strptime(as.character("01.01.2017","02.01.2011","03.01.2011",
"01.01.2011","02.01.2011","03.01.2011"),"%d.%m.%Y")),
week =c(1,2,2,
1,2,2),
eatencookies=c(1,0.5,0.001,
50,51,200))
exdatframe
#Now I want a new dataframe with only the first row per week (i.e. I
want to know how many cookies were eaten at the first recorded day of
each week). Something like that:
exdatframe2 <- data.frame(Name=c("Ernie","Ernie",
"CookieMonster","CookieMonster"),
recordedTime=c("01.01.2017","02.01.2011",
"01.01.2011","02.01.2011"),
week =c(1,2,
1,2),
eatencookies=c(1,0.5,
50,51))
exdatframe2
# How do I do that? I thought it must be something with tapply or subset
- but I just don't get it....
# would be great if someone helps.
# Dagmar
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