Calculate/convert to an isotope `fractionation_factor`

to_ff(iso1, iso2) # S4 method for ANY,ANY to_ff(iso1, iso2) # S4 method for FractionationFactor,missing to_ff(iso1, iso2) # S4 method for FractionationFactors,missing to_ff(iso1, iso2) # S4 method for Ratio,Ratio to_ff(iso1, iso2) # S4 method for Delta,missing to_ff(iso1, iso2) # S4 method for Delta,Delta to_ff(iso1, iso2)

iso1 | the top compound in the fractionation factor |
---|---|

iso2 | the bottom compound in the fractionation factor |

isotope `fraction_factor`

object if parameters can be converted, an error otherwise

The `to_ff(...)`

function calculates the fractionation factor between two isotope data objects
(for example two `delta`

values, two `ratio`

, or two `ff`

).
All calculatinos are only permissible if the isotope values have matching
attributes and fractionation factors will be returend in the default notation
(see `set_iso_opts`

for details)

Some of the conversions are also implemented in arithmetic shorthand, for example to generate
an fractionation factor in alpha notation from two ratios
`to_ff(ratio(), ratio())`

is the same as `ratio() / ratio()`

.
See arithmetic for details.

Other data type conversions: `to_abundance`

,
`to_delta`

, `to_ratio`