: Introduced the ~ notation (tilde) to denote ignored inputs in function declarations or outputs in function calls. Desktop Redesign :

MATLAB Release 2009b (version 7.9) represents a significant milestone in technical computing, bridging the gap between legacy environments and modern 64-bit multi-core processing. This professional version, often distributed via ISO disk images , remains a critical legacy tool for researchers and engineers maintaining code from the late 2000s.

It was the first release to officially support Windows 7 and Mac OS X 10.6 (Snow Leopard) .