A collection of trouble-shooting steps.
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Java Heap Problem
When loading or saving large XML files, MATLAB sometimes reports problems due to insufficient heap memory for the Java Virtual Machine.
You can increase the heap space for the Java VM in MATLAB 6.0 and higher by creating a java.opts
file in the $MATLAB/bin/$ARCH (or in the current directory when you start MATLAB) containing the
following command:
-Xmx$MEMSIZE
Recommended:
-Xmx536870912
which is 512Mb of heap memory.
An additional workaround reported in case the above doesn't work:
It sometimes happens with MATLAB R2007b on WinXP that after you create the java.opts file, MATLAB won't start (it crashes after the splash-screen).
The workaround is to set an environment variable MATLAB_RESERVE_LO=0.
This can be set by performing the following steps:
- Select Start->Settings->Control Panel->System
- Select the "Advanced" tab
- On the bottom, center, click on "Environment variables"
- Click "New" (choose the one under "User variables for Current User")
- Enter
Variable Name: MATLAB_RESERVE_LO
Variable Value: 0
- Click OK as many times as needed to close the window
Then edit/create the java.opts file as described above. You can also specify the units (for instance -Xmx512m or -Xmx524288k or -Xmx536870912 will all give you 512 Mb).
LTPDA Directory Name
Problems have been seen on Windows machines if the LTPDA toolbox directory name contains '.'.
In this case, just rename the base LTPDA directory before adding it to the MATLAB path.