This is documentation for Mathematica 8, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

CellLabelAutoDelete

CellLabelAutoDelete
is an option for Cell which specifies whether a label for the cell should be automatically deleted if the contents of the cell are modified or the notebook containing the cell is saved in a file.
Create a notebook with the setting CellLabelAutoDelete->True:
When inputs are evaluated, cell labels are attached to the input and output cells:
If you edit a previously evaluated input cell, its cell label is cleared:
When the notebook is saved, cell labels are automatically deleted:
When the notebook is reopened, no cell labels are present:
Create a notebook with the setting CellLabelAutoDelete->True:
When inputs are evaluated, cell labels are attached to the input and output cells:
If you edit a previously evaluated input cell, its cell label is cleared:
When the notebook is saved, cell labels are automatically deleted:
In[3]:=
Click for copyable input
In[4]:=
Click for copyable input
When the notebook is reopened, no cell labels are present:
Create a notebook with the setting CellLabelAutoDelete->False:
When inputs are evaluated, cell labels are attached to the input and output cells:
Because CellLabelAutoDelete is turned off, editing an input does not reset its cell label:
Neither does saving and reopening the notebook:
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