How to save() with a particular variable name

I am repeatedly applying a function to read and process a bunch of csv files. Each time it runs, the function creates a data frame (开发者_JAVA技巧this.csv.data) and uses save() to write it to a .RData file with a unique name. Problem is, later when I read these .RData files using load(), the loaded variable names are not unique, because each one loads with the name this.csv.data....

I'd like to save them with unique tags so that they come out properly named when I load() them. I've created the following code to illustrate .

this.csv.data = list(data=c(1:9), unique_tag = "some_unique_tag")
assign(this.csv.data$unique_tag,this.csv.data$data)
# I want to save the data, 
# with variable name of <unique_tag>, 
# at a file named <unique_tag>.dat
saved_file_name <- paste(this.csv.data$unique_tag,"RData",sep=".")
save(get(this.csv.data$unique_tag), saved_file_name)

but the last line returns:

"Error in save(get(this_unique_tag), file = data_tag) : 
  object ‘get(this_unique_tag)’ not found"

even though the following returns the data just fine:

get(this.csv.data$unique_tag)

Just name the arguments you use. With your code the following works fine:

save(list = this.csv.data$unique_tag, file=saved_file_name)

My preference is to avoid the name in the RData file on load:

obj = local(get(load('myfile.RData')))

This way you can load various RData files and name the objects whatever you want, or store them in a list etc.

You really should use saveRDS/readRDS to serialize your objects. save and load are for saving whole environments.

saveRDS(this.csv.data, saved_file_name)
# later
mydata <- readRDS(saved_file_name)

you can use

save.image("myfile.RData")

This worked for me:

env <- new.env()
env[[varname]] <- object_to_save
save(list=c(varname), envir=env, file='out.Rda')

You could probably do it without a new env (but I didn't try this):

.GlobalEnv[[varname]] <- object_to_save
save(list=c(varname), envir=.GlobalEnv, file='out.Rda')

You might even be able to remove the envir variable.