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Net 222: Communications and networks fundamentals ( Practical Part)

Net 222: Communications and networks fundamentals ( Practical Part). Tutorial 2 : Matlab - Getting Started. Lecture Contents. Getting Started. The MATLAB Desktop. Command window. Command History window. Current Folder window. Workspace window. Matlab menu bar.

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Net 222: Communications and networks fundamentals ( Practical Part)

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  1. Net 222: Communications and networks fundamentals (Practical Part) Tutorial 2 : Matlab - Getting Started Networks and Communication Department

  2. Lecture Contents • Getting Started. • The MATLAB Desktop. • Command window. • Command History window. • Current Folder window. • Workspace window. • Matlabmenu bar. Networks and Communication Department

  3. Matrix Laboratory • Matlab= Matrix Laboratory • A software environment for interactive numerical computations • Examples: • Matrix computations and linear algebra • Solving nonlinear equations • Numerical solution of differential equations • Mathematical optimization • Statistics and data analysis • Signal processing • Modelling of dynamical systems • Solving partial differential equations • Simulation of engineering systems Networks and Communication Department

  4. MATLAB Toolboxes • MATLAB has a number of add-on software modules, called toolboxes, that perform more specialized computations. • Signal & Image Processing Signal Processing- Image Processing Communications – System Identification - Wavelet Filter Design • Control Design Control System - Fuzzy Logic - Robust Control - μ-Analysis and Synthesis - LMI Control Model Predictive Control More than 60 toolboxes! Networks and Communication Department

  5. Simulink • Simulink- a package for modeling dynamic systems. Networks and Communication Department

  6. Simulink (Cont.) • Analyzing results: Networks and Communication Department

  7. Getting Started. • MATLAB offers engineers, scientists, and mathematicians an intuitive language for expressing problems and their solutions mathematically and graphically. • It integrates computation, visualization, and programming in a flexible, open environment. • Complex numeric and symbolic problems can be solved in a fraction of the time required with other languages such as C, Fortran, or Java. Networks and Communication Department

  8. The MATLAB Desktop • MATLAB has an extensive graphical user interface. When MATLAB starts, the main MATLAB window appears. • The Desktop menu controls the layout and appearance of the windows and gives you a list of the windows you can use. Networks and Communication Department

  9. Networks and Communication Department

  10. The MATLAB environment is command oriented Networks and Communication Department

  11. The first four appear by default, the first time you use MATLAB. Networks and Communication Department

  12. The Start button in the bottom left corner of the MATLAB Desktop brings up demos, tools, and other windows. Networks and Communication Department

  13. All MATLAB windows are docked in the default desktop, which means that they are tiled on the main MATLAB window. Docked window Undocked window Networks and Communication Department

  14. Command window MATLAB expressions and statements are evaluated as you type them in the Command Window, and results of the computation are displayed there too. Networks and Communication Department

  15. Command window • MATLAB expressions and statements are evaluated as you type them in the Command Window, and results of the computation are displayed there too. • Expressions and statements are also used in M-files (see it later). • They are usually of the form: or simply: Networks and Communication Department

  16. Command window (Cont.) • Expressions are usually composed from operators, functions, and variable names. • Evaluation of the expression produces a matrix (or other data type), which is then displayed on the screen or assigned to a variable for future use. • If the variable name and = sign are omitted, a variable ans(for answer) is automatically created to which the result is assigned. Networks and Communication Department

  17. Command window (Cont.) • A statement is normally terminated at the end of the line. However, a statement can be continued to the next line with three periods (...) at the end of the line. • Several statements can be placed on a single line separated by commasor semicolons. • MATLAB is case-sensitive in the names of commands, functions, and variables, so A and a are two different variables. Networks and Communication Department

  18. Command window (Cont.) • A comma or blank separates the elements within a row of a matrix (sometimes a comma is necessary to split the expressions, because a blank can be ambiguous). • A semicolon ends a row. Networks and Communication Department

  19. Command window (Cont.) • You can save the Command Window dialog with the diarycommand: • This causes what appears subsequently in the Command Window to be written to the named file (if the filename is omitted, it is written to a default file named diary) until you type the command diary off; the command diary on causes writing to the file to resume. • When finished, you can edit the file as desired and print it out. Networks and Communication Department

  20. Command window (Cont.) • Tab completion is another helpful shortcut. It works in both the Command Window and the Editor. • Start typing a command name, a variable name, or a filename. Before you type it all in, hit the tab key. Try typing z then a tab. A list of all the functions and variables that start with z will pop up. Select one from the list, or keep typing to narrow down the selection. Networks and Communication Department

  21. Command window (Cont.) • You can clear the Command Window with the clc command or with Edit > Clear Command Window. Networks and Communication Department

  22. Command History window This window lists the commands typed in so far. You can re-execute one more commands from this window by double-clicking or dragging the command(s) into the Command Window. Networks and Communication Department

  23. Current Folder window The Current Folder window displays a list of the files in your current folder. The name of this folder also appears at the top of the main MATLAB window, in the MATLAB Toolbar. Your current folder is the first place MATLAB looks for your M-files, and for workspace (.mat) files containing data that you load and save. MATLAB also looks in all the folders in your MATLAB path. Folders that are not on your MATLAB path are shown in gray. Networks and Communication Department

  24. Current Folder window (Cont.) • The commands: pwdreturns the name of the current folder. cdchanges the current folder. dirlists the contents of the current folder, whatlists only the MATLAB-specific files in the folder grouped by file type. deleteandtypecan be used to delete a file and display a file in the Command Window, respectively. Networks and Communication Department

  25. Workspace window The Workspace window lists variables that you have either entered or computed in your MATLAB session. Networks and Communication Department

  26. Workspace window (Cont.) • All the matrices and other variables that you create, except those internal to M-files, are shown in your Workspace window. • Double-clicking on a variable in the Workspace window pulls up the Variable Editor. Networks and Communication Department

  27. Workspace window (Cont.) • The command: whoslists the variables currently in the workspace. clear variablenameclear a variable or a function from the workspace. (or by right-clicking the variable in the Workspace window and selecting Delete) clearclears all variables from the workspace. Networks and Communication Department

  28. Workspace window (Cont.) • When you log out or exitMATLAB, all variables are lost. However, invoking the command save before exiting writes all variables to a binary file named matlab.mat in the current folder. • When you later reenter MATLAB, the command load restores the workspace to its former state. Networks and Communication Department

  29. Matlab menu bar Networks and Communication Department

  30. Matlab menu bar(Cont.) Networks and Communication Department

  31. Matlab menu bar (Cont.) Networks and Communication Department

  32. Matlab menu bar (Cont.) Networks and Communication Department

  33. Matlab menu bar (Cont.) Networks and Communication Department

  34. Matlab menu bar (Cont.) Networks and Communication Department

  35. Matlab menu bar (Cont.) Networks and Communication Department

  36. Some Useful MATLAB commands Networks and Communication Department

  37. Math • MATLAB can do simple math just as a calculator. Networks and Communication Department

  38. Interactive Calculations • Matlab is interactive, no need to declare variables. • Most elementary functions and constants are already defined. Networks and Communication Department

  39. Functions • MATLAB has many built-in functions. • Some math functions are: Networks and Communication Department

  40. The Help System Networks and Communication Department

  41. The help system example Networks and Communication Department

  42. MATLAB Variable Names • Variable names ARE case sensitive • Variable names can contain up to 63 characters (as of MATLAB 6.5 and newer) • Variable names must start with a letter followed by letters, digits, and underscores. Networks and Communication Department

  43. MATLAB Special Variables Networks and Communication Department

  44. MATLAB Math & Assignment Operators Networks and Communication Department

  45. The End Any Questions ? Networks and Communication Department

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