Why do I receive the warning "library class already exists" using LOADLIBRARY in MATLAB 7.0 (R14)?

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MathWorks Support Team
When I run the following code:
hfile = [matlabroot '\extern\include\matrix.h'];
loadlibrary('libmx.dll', hfile)
I receive the following warning:
Warning: The library class 'libmx' already exists

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采纳的回答

MathWorks Support Team
This warning occurs in MATLAB 7.0 (R14) and later due to the fact that the library class has already been loaded.
To prevent this warning, use the UNLOADLIBRARY command:
unloadlibrary libmx
hfile = [matlabroot '\extern\include\matrix.h'];
loadlibrary('libmx.dll', hfile)

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