Command window, MATLAB

MATLAB is most at home dealing with arrays, which we will refer to as matrices and vectors. They are all created by enclosing a set of numbers in brackets, [ ]. First, we define a row vector by entering in the MATLAB Command Window ... 

To launch the LTI Viewer, enter in the MATLAB command window ltiview... 

The LTI Viewer runs in its own workspace, which is separate from the MATLAB workspace. The Viewer also works with only LTI objects generated by functions such as tf () and zpk (), and after Chapter 4, state space objects, ss (). So let s generate a couple of objects in the MATLAB command window first ... 

Simulink shares the main MATLAB workspace. When we enter information into, say, the transfer function block, we can use a variable symbol instead of a number. We then define the variable and assign values to it in the MATLAB command window. This allows for a much quicker route to do parametric studies than changing the numbers within the Simulink icons and dialog boxes. 

To launch the root focus design tool, enter within the MATLAB command window ... 

These files are simple text files and may be created in a variety of ways. One way is via die normal Notepad text editor. Simply type in a series of statements, and store diem as a file with extension. m. There are five ways in which diis file can be ran from die Matlab command window. 

Open the m file, cut and paste the text, place into die Matlab command window and press the return key. The program should ran provided diat diere are no errors. 

In the MATLAB Command Window, type the following commands as shown. x= 10... 

The MATLAB Command Window for Example 15.4 is shown in Figure 15.12. The plot of volume versus x is shown in Figure 15.13. 

In Secdon 14.8, plots of data points revealed that the teladonship between y and x is qua-dradc (second order polynomial). To obtain the coefficients of the second order polynomial that best fits the given data, we will type the following sequence of commands. The MATLAB Command Window for Example 14.11 (Revisited) is shown in F jire 15.27. 

The relative error vector x = [0.23076 0.17218 0.17253 0.14836 0.08526 0.01596], and enter this vector into Matlab and save (command save data x), and then in the MATLAB command window enter the following two lines and then pressing the Enter key ... 

In the MATLAB command window enter the following two lines after pressing the Enter key ... 

Type the following two lines in the MATLAB command window and then... 

To start MATLAB, double click the corresponding icon, after a few moments the MATLAB Command Window will appear as shown in Fig. 8.1. In the command mode you can type a MATLAB command to which we will come back later. Now type Simulink. What appears is the Simulink library browser, as shown in Fig. 8.2. You now have various options to select building blocks for your simulatioa The blocks that are used mostly are in the following groups ... 

In a simulation, process parameters will be assigned mrmeric values. Rather than using these in the simulation, it is preferred to use variable names in the simulation and assign values to them in a separate file. To do so, select File, New, m-file in the Matlab command window. This opens the Matlab editor which enables you to assign values to parameters as shown in Fig.8.3. 

Instead of the MATL AB command mode, one could also use the identification graphical user interface (ID-GUI) to identify the model. Type clear and clc in the MATLAB command window to clear the workspace. Then type load pll to load the data and whos to see the variable names, they should be JTand T. Now type ident to start the ID-GUI after which Fig. 24.6 should appear. 

In this section, you will start learning how to use MATLAB to do mathematics. You should read this chapter with your computer running MATLAB. Try the commands in the MATLAB Command Window as you go along. Feel free to experiment with the given examples at the same time, you may also modify them to familiarize yourself with MATLAB. The best way to find out how MATLAB responds to a command is to try it. 

Using the MATLAB Command Window and its built-in library functions (see Table I.IL evaluate the following expressions ... 

Figure 10.49 The level of displaying the results to the MATLAB Command Window.

A MATLAB code, or m-file, is a collection of commands that are executed sequentially. Commands can be mathematical operations, function calls, flow control statements, and calls to the functions and scripts described in Section C.1.4. m-files are written using the MATLAB editor and have names such as my file. m. They are executed from the MATLAB command window by typing the name of the m-file (without the. m). Saving an m-file will avoid many hours of retyping the same commands. 

To obtain the unit impulse response of a single transfer function, use the function impulse from the MATLAB command window. 

Figure C.l shows the Simulink diagram for Eq. C-1 (transport delay 1 = 5 for both models). To generate a transient response, the simulation menu is selected to allow parameters for the simulation to be specified (start time, stop time, integration routine, maximum integration step size). Numerical values of time t are entered into the input-output data set via a clock block. After the simulation has been completed, the resulting data can be plotted (see Fig. C.2), manipulated, and analyzed from the MATLAB command window.

Several navigational commands from DOS and UNIX may be executed from the MATLAB Command Window, such as cd, dir, mkdir, pwd. Is. For example ... 

The symbol % indicates that this line contains comments. The % sign, and what comes after it in that line, will be ignored at the time of execution. Return to the MATLAB command window and type ... 

It is important that the search path used by MATLAB is set correctly so that the files may be found from any directory that MATLAB may be running. In the MATLAB Command Window choose File, Set Path. This will open the Path Browser. From the menu of the Path Browser choose Path, Add to Path. Add the directories of your hard disk where the Numerical Methods programs have been installed (the default directory for the WINDOWS installation is C Program Files Numerical Methods Chapterl, etc.). The path should look as in Fig. 2, provided that the default directory was not modified by the user during setup. 

When MATLAB starts up (in either Windows or Macintosh environments), the MATLAB Command Window and subsidiary windows appear as follows ... 

Consider the following MATLAB Command Window session ... 

A MATLAB Command Window session where the initial guess for the concentrations is given and f solve is called appears below. The solution vector for the concentrations is essentially identical to that of Example 9.4. 

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