A_from_a() calculates the isotope delta value of A from the isotope fractionation factor and the isotope delta value of B.

## Usage

A_from_a(a, B)

## Arguments

a

Isotope fractionation factor between A and B.

B

Isotope delta value of B (‰).

## Value

Returns the isotope delta value of B (‰).

a_A_B() calculates the isotope fractionation factor between A and B.
B_from_a() calculates the isotope delta value of B.
A_from_a(a = 1.033, B = -10)