Creates an antigenic map from an input data frame that can be used to calculate cross reactivity. This will end up being an NxN matrix, where there are N strains circulating.
melt_antigenic_coords(anti.map.in)a matrix of Euclidean antigenic distances between each pair of entries in `anti.map.in`
Other antigenic_maps:
euc_distance(),
generate_antigenic_map_flexible(),
setup_antigenic_map()