[Problem] Undo does not remember

Symptom

Lost a cell contents and undo doesn’t remember.

Suspected diagnosis

There are separate undo functions for cell operations and for changes inside of cells so chances are low that this ever happens. If it does there are several methods to recover data.

• wxMaxima actually has two undo features. The global undo buffer that is active if no cell is selected and a per-cell undo buffer that is active if the cursor is inside a cell. It is worth trying to use both undo options in order to see if an old value can still be accessed.
• If you still have a way to find out what label Maxima has assigned to the cell just type in the cell’s label and its contents will reappear.
• If you don’t: Don’t panic. In the View menu there is a way to show a history pane that shows all Maxima commands that have been issued recently.

Possible cure

If nothing helps, Maxima contains a replay feature.

playback();