Dear R list users,
I have three lists of data frames, respectively temp_list, wind_list and
snow_list.
The elements of these three lists are
temp_list$station1, temp_list$station2 and temp_list$station3 with columns date
and temp;
wind_list$station1, wind_list$station2 and wind_list$station3 with columns date,
wind_vel and wind_dir;
snow_list$station1, snow_list$station2 and snow_list$station3 with columns date
and hs
where date has been transformed to character.
I need to merge temp_list$station1, wind_list$station1 and snow_list$station1,
and same thing for station2 and station3.
If I create a list
list_all <- list(temp_list$station1, wind_list$station1, snow_list$station1)
then
Reduce(function(x, y) merge(x, y, by=c("date"), all=TRUE), list_all)
will do it. But then I have to create the other two lists and apply again
Reduce.
I would like to create a list of list and using lapply twice in order to get
this process completely automatic.
I tried
list_all <- list(temp_list, wind_list, snow_list)
names(list_all) <- c("temp", "wind", "snow")
lapply(names(list_all), function(val){list_all$val,
lapply(c("station1", "station2", "station3"),
function(val){Reduce(function(x, y) merge(x$val, y$val, by=c("date"),
all=TRUE), list_all)}), list_all})
but it gives me a syntax error and I am struggling to make it work.
Could someboby help me to create the correct loop?
Thank you for your help
Stefano
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