If absorbance_path is a directory, contained files that end on "csv" or "txt" are passed on to read.table. If the path is a file, this file is read. Tables can either contain data from one sample or from several samples in columns. The first column is considered the wavelength column. A multi-sample file must have sample names as column names. All tables are combined to one with one wavelength column and one column for each sample containing the absorbance data.
Column and decimal separators are guessed from the supplied data. In some cases, this can lead to strange results. Plaese set `sep` and `dec` manually if you encounter any problems.