M-file, MATLAB

In the previous sections we have used MATLAB commands that were typed in on the desktop command line, as well as MATLAB commands that invoke special stored MATLAB files, called m files. When starting to work with MATLAB, we advise our users to create a special folder for their personal MATLAB m files once and to continue to use this folder to store personal m files. To access the stored m files from the MATLAB desktop, the user has to point the small desktop window called Current Directory to the personal m file folder. Then all stored m files, as well as all built in MATLAB functions can be accessed, called upon, and used from the command line. All stored personal... 

MATLAB m files can contain any number of MATLAB commands. They are handy for long sets of MATLAB instructions or data and afford easy repeated use and easy modification. There are two kinds of MATLAB m files function and script m files. Script m files such as poly9. m on p. 28 use the data that is defined inside of them and any undefined data is taken from the data (with the proper name) that is currently active on the workspace look at the top left window commonly displayed on the MATLAB desktop for a list of defined variables and their type. Script files overwrite the workspace data as instructed in their code. 

The reader should study our earlier MATLAB m files now, such as the script m file poly9. m on p. 28 and the function m file fzerotryl. m on p. 27 and look for their differences. 

Figure 3.7 is drawn by calling adiabNisocolorcontour(15000,95000,1,15,100). The code of the contour-plotting MATLAB m file adiabNisocolorcontour. m follows below. 

As in Section 3.1 for the adiabatic CSTR problem, we again start with a generic MATLAB fzero.m based root finder to try to settle the issues of multiplicity in the nonadiabatic CSTR case. The MATLAB m file solveNadiabxy. m below finds the values for y (up to three values if a lies in the bifurcation region) that satisfy equation (3.12) for the given values of a, / , 7, Kc, and yc using MATLAB s root finder fzero. 

Figure 3.15 was drawn using the MATLAB m file kctriple.m on the CD that accompanies the book. 

Our final MATLAB m file in this section rounds out our efforts just as Figure 3.10 did for the adiabatic CSTR problem. It uses the plotting routine for Figure 3.18 in conjunction with a MATLAB interpolator to mark and evaluate the (multiple) steady state(s) graphically for nonadiabatic, nonisothermal CSTR problems. 

Project I Write a MATLAB m file that draws the surface z = f Kc, y) with / defined in equation (3.17), i.e., draw the top surface of Figure 3.14 alone. Repeat for the top surface of Figure 3.17 as well. 

We include the more complicated MATLAB m file realgas3dplot. m, which plots the volume as a surface, depending on the temperature and pressure for any real gas as shown in Figure 3.36. 

Create a MATLAB m file that draws the zero-contour curves F(y, K) = 0 of Figures 4.26 or 4.30 directly. 

When working with MATLAB we advise our readers to first create a separate folder or directory on his/her hard drive that is used exclusively for MATLAB m files, such as one called matlabin, for example. 

Step 1 You can use the following MATLAB m-file along with the fsolve command (available in the Optimization Toolbox) ... 

CAMPG assigns preferred integral causality so that the system ends up with an explicit set of differential equations (Fig. 11.14). However, if the system was assembled with dependent elements, those are assigned in the corresponding derivative causality form. It produces readymade MATLAB. m files which are used for computer simulation. 

Matlab m-files for analyzing data from supramolecular... 

Figure 2.3 MATLAB M-file lin2 l.m to solve EXAMPLE 2.1...

Figure 2.6 MATLAB M-file lin2 2.m to Solve Example 2.2...

Figure 2.11 MATLAB M-file bisec.m to determine the root of Equation (2.3.2) using the bisection method.

Figure 2.21 MATLAB M-file tangent. m for Solutions Using...

Figure 8.10 gives MATLAB m-file Band.m for implementing the band algorithm. An alternative formulation of the problem is possible in MAT-LAB. Rather than using the band algorithm directly, we can use the sparse matrix capability of MATLAB. The matrix to be inverted can be defined and stored in the sparse or band format (see Chapter 2, section 2.2.3.3). This option is particularly efficient in MATLAB. 

The following MATLAB m-file establishes the right-hand side function of the unconstrained truck model after dividing by the masses and torques. 

The following MATLAB m-files are sub-procedures to establish the relative kinematics and the force laws of special force elements ... 

The first line defines the function xpowers, which has two outputs sq and cube and one input. The second line is a comment statement that is used to tell what xpowers is all about. The third and fourth lines calculate the values of input squared and cubed, respectively. While the main MATLAB window is active, press CTRL+N to activate the MATLAB m-file editor and paste the previous four lines. Save the file as xpowers.m. 

Open Im Process.m using the built-in MATLAB M-file editor. 

As a result, the newgui.m file will open up via the MATLAB M-file editor, in addition to the newgui.fig itself as shown in Figs. 11.2 and 11.3. respectively. 

MATLAB, M-Files, and Input from Command Window... 

In this section, several MATLAB M-files are presented that perform operations previously visited using VBA. These include... 

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