The CLEAR command
Keywords: greg

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### The `CLEAR` command

Because of the multi-window and directory capabilities, the `CLEAR` command has many possible arguments.

- `CLEAR ALPHA` erases the alphanumeric screen alone, without affecting the plot. If possible, rather than erasing the alpha screen, the graphic screen (current window) is raised up.
- `CLEAR DIRECTORY [DirName]` makes the named directory (or by default the current directory) invisible. All the attached structure becomes invisible.
- `CLEAR GRAPHIC` lowers the graphic windows, popping up the alpha screen.
- `CLEAR PLOT` is equivalent to either `CLEAR TREE` or `CLEAR WHOLE`, depending on user preference as expressed in command `CHANGE CLEAR`.
- `CLEAR SEGMENT` destroys the last graphic segment, i.e. the part of the plot corresponding to the last graphic command. Can be used repetitively.
- `CLEAR SEGMENT SegName` makes the named segment invisible. This is equivalent to `CHANGE VISIBILITY NameSeg OFF`.
- `CLEAR TREE` deletes the current directory, that is all subdirectories descending from the current main directory. Other parallel trees (if any) are not destroyed.
- `CLEAR WHOLE` deletes the whole plot, all main directories and their subdirectories. A new (empty) main directory is automatically recreated with one associated window.
- `CLEAR WINDOW` delete the current graphic window. Beware that this may leave the plot with no associated window.

Next: Plotting Depth Up: Plot Architecture and Multi-Window Previous: Windows Contents Index