I have several large R objects saved as .RData files: "this.RData", "that.RData", "andTheOther.RData" and so on. I don't have enough memory, so I want to load each in a loop, extract some rows, and unload it. However, once I load(i), I need to strip the ".RData" part of (i) before I can do anything with objects "this", "that", "andTheOther". I want to do the opposite of what is described in How to iterate over file names in a R script? How can I do that? Thx
Edit: I omitted to mention the files are not in the working directory and have a filepath as well. I came across Getting filename without extension in R and file_path_sans_ext takes out the extension but the rest of the path is still there.
Do you mean something like this?
i <- c("/path/to/this.RDat", "/another/path/to/that.RDat") f <- gsub(".*/([^/]+)", "\\1", i) f1 <- gsub("\\.RDat", "", f) f1  "this" "that"
On windows' paths you have to use
"\\" instead of
Edit: Explanation. Technically, these are called "regular expressions" (regexps), not "patterns".
. any character
.* arbitrary number (including 0) of any kind of characters
.*/ arbitrary number of any kind of characters, followed by a
[^/] any character but not
[^/]+ arbitrary number (1 or more) of any kind of characters,
) enclose groups. You can use the groups when
So, look for any kind of character, followed by
/, followed by
anything but not the path separator. Replace this with the "anything
but not separator".
There are many good tutorials for regexps, just look for it.