WINDOW BASIC 7.0 command

The help features and the Command Window interface tend to evolve quickly. For that reason, we use our Web Support to provide additional hints and tidbits so we can keep you update of the latest MATLAB changes. For now, we will introduce a few more basic commands ... 

The input window consists of two windows. The left, initially blank window is the space to enter the chemical analysis to be modeled together with the commands to perform the particular modeling task. PHREEQC keywords and PHREEQC BASIC statements may be listed in the right window. A mouse click on the + symbol displays the list of keywords. The utilization of the BASIC commands is explained in chapter 2.2.2.22. 

There are many versions of Matlab and of Windows and for the more elaborate interfaces between die two packages it is necessary to refer to technical manuals. We will illustrate diis section with Matlab version 5.3, although many readers may have access to more up-to-date editions. All are forward compatible. There is a good on-line help facility in Matlab type help followed by die command, or follow the appropriate menu item. However, it is useful first to have a grasp of the basics which will be described below. 

Note that Visual Basic code activated by the command buttons SETUP , SOLVE and CHOOSE POLYNOMIALS provide for concerted calculations from the final worksheet. The code controlling these actions can be viewed using the command sequence ALT/Ell which renders the Visual Basic window visible. 

Using the Windows Explorer is actually pretty simple. Just a few basic instructions will be all you will need to start working with it. First off, the Explorer interface itself has a number of parts, each of which serves a specific purpose. The top area of the Explorer is dominated by a set of menus and toolbars that allow easy access to common commands. The main section of the window is divided into two panes. The left pane displays the drives and folders available to... 

Once in the ALATLAB environment, you can assign values to a variable or define the elements of a matrix. For example, as shown in F%ure 15.2, to ass a value of 5 to the variable X, in the Command Window after the prompt sign you simply type x = 5. The basic MATLAB scalar (arithmetic) operations are shown in Table 15.1. 

As we have said before, en eers use formulas that represent physical and chemical laws governing our surroundings to analyze various problems. You can use MATLAB to input engineering formulas and compute the results. When typing your formula, use parentheses to dictate the order of operation. For example, in MATLAB s Command Window, if you were to type count=100+5 2, MATLAB will perform the muldplication first, which results in a value of 10, and then this result is added to 100, which yields an overall value of 110 for the variable count. If, however, you wanted MATLAB to add the 100 to 5 fiist and then multiply the resulting 105 by 2, you should have placed parentheses around the 100 and 5 in the following manner count=(100+5) 2, which results in a value of 210. The basic MATLAB arithmetic operations are shown in Table 15.3. 

The layout of MATLAB can be seen in Figure 4.1. There are a number of different layouts that the user can define, see Layout Tab. We select one basic layout that consists of the workspace, in the figure to the left top corner, where the variables are stored a command history, to the right bottom corner, where a log of operations is stored and the command window, where calculations can be executed. 

Needless to say that within MATLAB we have all the algebraic, statistical functions predefined along with plotting capabilities. Before briefly commenting on the basics, it is interesting to point out the use of help within the command window. We use the help function followed by any built-in function and MATLAB returns a small tutorial on the use of that function, the arguments, and the options (i.e., try help ode45 ). 

After loading the required configuration for the connected instruments, they can be addressed in each method and corresponding command forms become available in the editor window in addition to the basic and former described functions. 

---