> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/e3d-user-manual/interface/toc175916526/input-data/toc161393900.md).

# Nodes

How to enter and edit node coordinates in a spreadsheet and round off tiny coordinate values.

Tables > Nodes prompts you with the following dialog.

![](https://560001759-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FWNe8U6EBBBdUJHdb2X9G%2Fuploads%2Fgit-blob-b395fac9a1930ebb87ac39064c61ff01dae7060e%2FFASTFR~1_img146.png?alt=media)

It allows you to enter nodes in a spreadsheet. Each node includes the nodal coordinates and the selection status. You may not modify the node IDs.

An empty row is allowed if all rows below it are empty (except the node ID and status fields). You may not delete the existing nodes in the dialog. To delete the existing nodes, you must dismiss this dialog and click Modify > Delete.

Due to machine inaccuracy of floating point values, some commands (such as Modify > Rotate) may cause the presence of very small numerical coordinate values. You may round off these tiny values to be zeros by clicking the Round-off Coordinates button. The epsilon used for the round-off may be set from Settings & Tools > Data Options. The default epsilon value is 1e-10 and must be less than or equal to 1e-6.


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