Consolidate workspace memory
pack frees up needed space
by reorganizing information so that it only uses the minimum memory
required. All variables from your base and global workspaces that
are less than 2GB are preserved. Any persistent variables that are
defined at the time are set to their default value (the empty matrix,
Do not use the
The MATLAB® software temporarily stores your workspace data
in a file called
a numeric value) that is located in your temporary folder. (You can
use the command
dir(tempdir) to see the files in
pack filename frees space
in memory, temporarily storing workspace data in a file specified
filename. This file resides in your current
working folder and, unless specified otherwise, has a
pack('filename') is the
function form of
Change the current folder to one that is writable, run
and return to the previous folder.
cwd = pwd; cd(tempdir); pack cd(cwd)
You can only run
pack from the MATLAB command
If you specify a
filename argument, that
file must reside in a folder for which you have write permission.
pack function does not
affect the amount of memory allocated to the MATLAB process.
You must quit MATLAB to free up this memory.
Since MATLAB uses a heap method of memory management, extended MATLAB sessions may cause memory to become fragmented. When memory is fragmented, there may be plenty of free space, but not enough contiguous memory to store a new large variable.
If you get the
Out of memory message from MATLAB,
pack function may find you some free memory
without forcing you to delete variables.
pack function frees space by
Saving all variables in the base and global workspaces to a temporary file.
Clearing all variables and functions from memory.
Reloading the base and global workspace variables back from the temporary file and then deleting the file.
If you use
pack and there
is still not enough free memory to proceed, you must clear some variables.
If you run out of memory often, you can allocate larger matrices earlier
in the MATLAB session and use these system-specific tips:
When running MATLAB on The Open Group UNIX® platforms, ask your system manager to increase your swap space.
On Microsoft® Windows® platforms, increase virtual memory using the Windows Control Panel.
To maintain persistent variables when you run pack, use
mlock in the function.