Intro to MATLAB

Intro to MATLAB - An introduction to MATLAB MATLAB is an...

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Unformatted text preview: An introduction to MATLAB MATLAB is an important software package in engineering and is widely available. Most plots in Signals and Systems , 3/e, were generated using MATLAB. We give a brief intro- duction of MATLAB to the extent that the reader could generate most plots in Chapter 1 of the aforementioned book. MATLAB runs on a number of windows. The window which appears when we start MATLAB is called the command window . It is the primary window where we interact with MATLAB. A sequence of numbers, such as -0.6, -0.3, 0, 0.3, 0.6, 0.9, 6/5, can be expressed in MATLAB as a row vector as >> t=[-0.6 -0.3 0 0.3 0.6 0.9 6/5] where >> is a command prompt. If we type “enter” at the end of the line, MATLAB will execute and store it in memory, and then display it on the monitor as t= -0.6000 -0.3000 0 0.3000 0.6000 0.9000 1.2000 From now on, it is understood that every line will be followed by “enter”. If we type >> t=[-0.6 -0.3 0 0.3 0.6 0.9 1.2]; then MATLAB will execute and store it in memory but will not display it on the monitor. In other words, the semicolon at the end of a statement suppresses the display. Note that we have name the sequence t for later use. The MATLAB function a:b:c generates a sequence of numbers starting from a with increment b up to or less than c . For example,-0.6:0.3:1.2 generates the sequence t . If b is missing, then the increment is 1 by default. For example,-0.6:1.2 yields [-0.6 0.4] and n=-2:4 yields [-2 -1 0 1 2 3 4] . Using n , the sequence t can also be generated as t=0.3*n or t=n*0.3 . Suppose we want to compute the values of z ( t ) = 2 e- . 3 t sin 4 t at those t . Typing >> t=-0.6:0.3:1.2; >> z=2*exp(-0.3*t).*sin(4*t) will yield z =- 1 . 6174- 2 . 0396 0 1 . 7036 1 . 1284- . 6756- 1 . 3900 These are the values of z ( t ) at those t. We mention that the variable z consists of seven entries. MATLAB automatically assigns the entries by z(k), with k=1:7. We call the integer k the internal index . Internal indices start from 1 and cannot be zero or negative. If we continue to type >> z(2) then it will yield -2.0396. If we type z(0) or z(8), then an error message will appear because the internal index is zero or outside the range. Typingthe internal index is zero or outside the range....
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This note was uploaded on 02/24/2010 for the course ESE 337 taught by Professor Chi-tsongchen during the Fall '10 term at SUNY Stony Brook.

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Intro to MATLAB - An introduction to MATLAB MATLAB is an...

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