## Chapter 30: User Functions

The user function details view is used to create new interpolation functions (1D or 3D Cloud of Points), and user CEL functions. It is accessed from the Insert > Expressions, Functions and Variables > User Function or the User Function icon on the main toolbar.

User function objects you create are listed under Expressions, Functions and Variables > User Functions in the tree view. Based on the Option setting in the user function details view, there are three types of user function objects:

- Interpolation functions (1D or 3D Cloud of Points) are created by setting Option to `Interpolation (Data Input)`.

- Importing profile data from a file creates a user function object with the Option setting Interpolation (From File). This type of user function cannot be created directly by inserting a new user function but can be edited using the user function details view.

- User CEL functions are created by setting Option to `User Function`. This type of user function object must be created after a user CEL routine object.

This chapter describes:

- Interpolation (Data Input) User Functions
- Interpolation (From File) User Functions
- User CEL Functions

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