PPM - Parts per Million

ppm is a small helper function to determine the parts-per-million for a user-provided value and ppm.

Usage

ppm(x, ppm)

Arguments

x

numeric, value(s) used for ppm calculation, e.g. mz value(s).

ppm

numeric, parts-per-million (ppm) value(s).

Value

numeric: parts-per-million of x (always a positive value).

Author

Sebastian Gibb

Examples

ppm(c(1000, 2000), 5)
#> [1] 0.005 0.010

ppm(c(-300, 200), 5)
#> [1] 0.0015 0.0010