metadata_extraction: Metadata Extraction from NCBI/GISAID EpiCoV FASTA file
Description
This function retrieves metadata (ID, region, date) from the input FASTA file, with the source of, either
NCBI (with default FASTA header) or GISAID (with default FASTA header). The function will return a dataframe
that has three columns consisting ID, collected region and collected date. Records that do not have region or date
information will be excluded from the output dataframe.
Usage
metadata_extraction(file_path, source)
Value
A dataframe that has three columns consisting ID, collected region and collected date
Arguments
file_path
path of fasta file
source
the source of fasta file, either "NCBI" or "GISAID"