## 30.1. Interpolation (Data Input) User Functions

A user function with the option `Interpolation (Data Input)` is used to create a function from a set of coordinates paired with the values of a variable at those coordinates. For example, this could be used if you wish to specify an inlet temperature using some experimentally-measured values of temperature at various points on the inlet, or if you want to specify some property of a material as a function of temperature using a table of known values.

If you have data in a profile data file, then instead of creating a user function directly, you should import the profile data as described in Profile Boundary Conditions in the CFX-Solver Modeling Guide. More details can be found in Interpolation (From File) User Functions.

This section describes:

- One Dimensional Interpolation
- Three Dimensional Interpolation
- Importing Data from a File
- Defining User Functions from Interpolation (Data Input) Functions

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