Read all Files in Directory using R
To list all files in a directory in R programming language we use list.files(). This function produces a list containing the names of files in the named directory. It returns a character vector containing the names of the files in the specified directories. If no files are present in the directory, it returns “”. If a path does not exist it is skipped and a warning is shown.
Note: File naming conventions depend on the platform.
list.files(path, pattern, all.files, full.names)
Path: It is a character vector that contains pathname to directories.
Pattern: It is an optional regular expression. If this argument is provided then the function only returns the files that have given pattern in their name.
all.files: It is a logical value.
- FALSE: Only the names of visible files are returned.
- TRUE: All file names will be returned irrespective of whether they are visible or hidden.
full.names: It is a logical value.
- TRUE: The filename also contains the full path to the directory.
- FALSE: The filename doesn’t contain the path to the directory.
Directory in use:
It is also possible to produce only some specific files for that the extension of those files is passed as the value to parameter pattern.