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)
| anti.map.in | can either be a 1D antigenic line to calculate distance from, or a two dimensional matrix with x and y coordinates on an antigenic map |
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the euclidean antigenic distance between each pair of viruses in anti.map.in