# Functions Interface

The interface to VML functions includes function full names and the arguments list. The Fortran- and C-interface descriptions for different groups of VML functions are given below. Note that some functions (Div, Pow, and Atan2) have two input vectors a and b as their arguments, while SinCos function has two output vectors y and z.

- VML Mathematical Functions
- Pack Functions
- Unpack Functions
- Service Functions
- Input Parameters
- Output Parameters

Parent topic: Function Naming Conventions