weight(iso, weight) adds a weight (can be thought of as mass or concentration) to an isotopic value
which will be used to weigh the isotope value when adding together multiple isotope values.
get_weight(iso) returns the weight of an isotope value object.
weight(iso, weight) # S4 method for ANY,ANY weight(iso, weight) # S4 method for Isoval,numeric weight(iso, weight)
- object to get weight or add weight
- vector of weight values, has to be a single value or the same length as the data stored in the isotope value object.
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