Help keywords>> help HELP topics: ops - Operators and special characters. winfun - Windows Operating System Interface Files (COM/DDE) winfun/NET - Using .NET from within MATLAB demos - Examples. lang - Programming language constructs. polyfun - Interpolation and polynomials. timefun - Time and dates. elmat - Elementary matrices and matrix manipulation. strfun - Character strings. randfun - Random matrices and random streams. helptools - Help commands. guide - Graphical user interface design environment graph2d - Two dimensional graphs. graph3d - Three dimensional graphs. graphics - Handle Graphics. plottools - Graphical plot editing tools scribe - Annotation and Plot Editing. specgraph - Specialized graphs. uitools - Graphical user interface components and tools toolbox/local - General preferences and configuration information. specfun - Specialized math functions. optimfun - Optimization and root finding. datafun - Data analysis and Fourier transforms. sparfun - Sparse matrices. iofun - File input and output. datatypes - Data types and structures. verctrl - Version control. images matfun - Matrix functions - numerical linear algebra. funfun - Function functions and ODE solvers. elfun - Elementary math functions. codetools - Commands for creating and debugging code general - General purpose commands.