### 30.1.3. Importing Data from a File

After you create a user function (Insert > Expressions, Functions and Variables > User Function), you see the function in the details view with the Option set to `Interpolation (Data Input)`.

To import data from a file, set the Interpolation Data > Option setting as desired, then right-click in the Interpolation Data list and select Import Data... from the shortcut menu. This displays the Import Cloud Interpolation Data dialog box.

- For 1D data, Column Selection fields appear. You can select which column of data in your import file is appropriate for the coordinates and values.

- For 3D interpolations, columns are selected in the same way, with X, Y, and Z data all required.

- Each line of the file must contain numbers, separated by a space or comma.

- Once the data is read into CFX-Pre, the values will be written directly to the solver input file and the data file will not be read again. If its contents are changed, then you must return to CFX-Pre and explicitly import the data again to update the stored values.

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