Assuming datums is a vector of the unique dates in Date... perhaps
datums <- sort(unique(dataset1$Date))
I usually set it up like this
for (i in 1:length(datums) ) {
crnt.date <- datums[i]
tmpdat <- subset(dataset1, Date==crnt.date)
cat(i, format(crnt.date), 'dim(tmpdat)',dim(tmpdat),'\n
Here is a self-contained example of what you might be trying to do.
You would get better answers if you supplied this yourself.
dataset1 <-
data.frame(Date=as.POSIXct(c("2015-04-01","2015-04-01","2015-04-07",
"2015-04-19")), Weight=11:14)
datums <- as.POSIXct(c("2015-04-01", "2015-04-08", "2015-04
Hi,
What about using functions like aggregate()?
Something like:
aggregate(Weight~datums, data=dataset1, FUN=mean)
If you need to do more things, you can create your own function for 'FUN'
HTH,
Ivan
--
Ivan Calandra, ATER
University of Reims Champagne-Ardenne
GEGENAA - EA 3795
CREA - 2 esplana
Dear all,
I would like to do multiple actions on a subset of my data. Therefore, I want
to create a for loop on the variable "Date" (actually a double for loop on yet
another variable, but let's omit that for a moment).
I want to run down every level of "Date" and perform multiple actions on the
Does this do what you want:
> data1
A B
1 1 a
2 1 b
3 2 c
4 2 d
> data2
D E F
1 x y 1
2 w z 2
> data1.1 <- aggregate(data1$B, list(data1$A), FUN=paste, collapse=',')
> data1.1
Group.1 x
1 1 a,b
2 2 c,d
> merge(data2, data1.1, by.x="F", by.y="Group.1")
F D E x
1 1 x y a,b
2
Hi all,
Suppose I have
data1
A B
1 a
1 b
2 c
2 d
and
data2
D E F
x y 1
w z 2
and I want
data2
D E F G
x y 1 a,b
w z 3 c,d
I am trying
data2$G=list(data1$B[data1$A==data2$F,])
How do I correct this approach?
--
View this message in context:
http://r.789695.n4.nabble.com/Subsetting-questi
6 matches
Mail list logo
