MATLAB command input

We note that fzerotryl is a MATLAB function m file that is stored in its folder with the extension. m as fzerotryl.m. Our program code is annotated with comments following the % symbol. Anything that follows after a % symbol on a line of code is not executed in MATLAB. More on MATLAB files, their storage, creation, etc. is given in Section 1.2.5. Specific built-in MATLAB functions and their use, such as fzero in the code below, should always be scrutinized by our students for their input/output syntax etc. using the built-in help MATLAB command help fzero for example. 

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. 

Typing a semicolon at the end of an input line suppresses printing of the output of the MATLAB command. The semicolon should generally be used when defining large vectors or matrices (such as X = 1 0.01 3 ). It can also be used in any other situation where the MATLAB output need not be displayed. 

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.

Save these statements in a file named, say, plotxy.m. Anything after the"%" sign is regarded as a comment, which you do not have to enter if you just want to repeat this exercise. After we have defined or updated the values of x and y in the Command Window, all we need is to enter "piotxy" at the prompt and MATLAB will do the rest. The key is to note that the M-file has no "read" or "input" for x and y. All statements in an M-file are simply executed in the Command Window. 

This closes the file that has already been opened for data input by MATLAB. So, the aforementioned commands can be put together here ... 

Figure 3.S shows the set of commands as they appear in the MATLAB m-editor. qroots.m simply accepts a, b, and c coefficient values from the user as input parameters calculates two terms terml and term2 that will be utilized in finding the two quadratic roots si and s2 and finally prints out the...

Hints Use the MATLAB MPC Toolbox, if desired, for this exercise. Two commands are used to produce a linear model of the plant in the representation needed for controller design. First, the dlinmod command obtains a state-space representation (A, B, C, D). To use this command, be sure that the Simuhnk diagram is drawn so that the process manipulated inputs and disturbances correspond to in ports on the top level of the Simulink flow sheet similarly, the outputs must correspond to out ports. Then the ss2mod command produces a model in MPC mod format, specifying inputs that are manipulated variables, measured disturbances, and unmeasured disturbances. The scmpc command simulates control of the hnearized plant with the MPC controller. 

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

Before writing a first M-file program, input/output with the command window must be covered. For MATLAB programs with small amounts of input, the input statement is used. For output to the Command Window, the usual method involves the fprintf statement. The syntax of the input statement is... 

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