Operation Manual

Chapter 18: Memory and Variable Management 336
4. Press } and † to move the selection cursor (4) next to the group variable you want to ungroup,
and then press Í.
The ungroup action is completed.
Note: Ungrouping does not remove the group from user data archive. You must delete the group in
user data archive to remove it.
Garbage Collection
Garbage Collection Message
If you use the user data archive extensively, you may see a Garbage Collect? message. This occurs if you
try to archive a variable when there is not enough free contiguous archive memory.
The
Garbage Collect? message lets you know an archive will take longer than usual. It also alerts you
that the archive will fail if there is not enough memory.
The message can also alert you when a program is caught in a loop that repetitively fills the user data
archive. Select
No to cancel the garbage collection process, and then find and correct the errors in your
program.
When YES is selected, the TI-84 Plus C will attempt to rearrange the archived variables to make
additional room.
Responding to the Garbage Collection Message
Note: The process message Defragmenting... is displayed whenever an application marked for
deletion is encountered. Garbage collection may take up to 20 minutes, depending on how much of
archive memory has been used to store variables.
After garbage collection, depending on how much additional space is freed, the variable may or may
not be archived. If not, you can unarchive some variables and try again.
Why Is Garbage Collection Necessary?
The user data archive is divided into sectors. When you first begin archiving, variables are stored
consecutively in sector 1. This continues to the end of the sector.
An archived variable is stored in a continuous block within a single sector. Unlike an application stored
in user data archive, an archived variable cannot cross a sector boundary. If there is not enough space
left in the sector, the next variable is stored at the beginning of the next sector. Typically, this leaves an
empty block at the end of the previous sector.
• To cancel, select
1:No.
• If you select 1:No, the message
ERROR:ARCHIVE FULL will be displayed.
• To continue archiving, select 2:Yes.
• If you select
2:Yes, the process message
Garbage Collecting... or Defragmenting...
will be displayed.