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
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Ivan Calandra, ATER
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Le 20/05/15 12:03, Dieter Anseeuw a écrit :
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
data from a certain date. Here is my code:
for (i in 1:length(datums)){
meanweight<-mean(dataset1[dataset1$Date==datums[i],]$Weight)
...
However, this subsetting obviously doesn't work. How can I adjust my code so
that R runs down all levels of Data in a for loop?
(I need the for loop, not tapply(), sapply(), ...)
Thanks in advance,
Dieter Anseeuw
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