This function reads all CSV files in the specified folder (or the current working directory, if no folder is provided) that match a given pattern. It selects a predefined set of columns from each CSV and merges the files into a single data frame.
Arguments
- folder
A string specifying the folder path where the CSV files are located. If
NULL, the function uses the current working directory.- pattern
A string representing the file name pattern to search for (default is "_results.csv"). This should be a regular expression that matches the files to be imported.
Value
A data frame containing the merged data from all CSV files, with the following columns: file_name, sensor_id, datetime, date, hour, index, value_l, value_r, and value_avg.
Examples
if (FALSE) { # \dontrun{
# Example: Import all CSV files matching the pattern "_results.csv" from a folder
folder_path <- "path/to/folder"
combined_data <- import_indices(folder = folder_path, pattern = "_results.csv")
# Example: Import from the current working directory with default pattern
combined_data <- import_indices()
} # }