Hi,
I am trying to perform various functions on a list with a number of elements.
For example. I would like to take the mean of different variable values in the
entire list. As an example,
say I have a list with 1000 elements and variables called Id and Tick. What I
would like to do is take the mean of a variable called X for each Tick in the
data element. So, there can be say 1 to 600 tick values per element in a list,
that would mean I would like to find the 600 mean values for each of the ticks
values in the 1000 elements.
I tried a simple attempt below, but I am sure it is way off as it didn't
produce what I expected:
//res=res[[1..1000]]
weightX<-sapply(res, function(.df) {mean(.df$X[.df$Id>0 & .df$Tick<601])})
Basically, I was trying to get the mean for all tick values less than 600 that
have an Id variable greater than 0. So, since there are 600 ticks I would like
to return a result with 600 mean values, for each of the 600 ticks, that
factors all the 1000 occurrences of each tick, starting from 1.
I hope this is clear. Thanks in advance.
Mark
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
