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An Introduction to MATLAB: Interactive Mode

Module by: Louis Scharf. E-mail the author

Note:

This module is part of the collection, A First Course in Electrical and Computer Engineering. The LaTeX source files for this collection were created using an optical character recognition technology, and because of this process there may be more errors than usual. Please contact us if you discover any errors.

In command mode, MATLAB displays a prompt (≫)(≫) and waits for your input. You may type any legal mathematical expression for immediate evaluation. Try the following three examples (press “enter” or “return” at the end of each line):

≫ 2+2
≫ 5^2
≫ 2*sin(pi/4)

The variable pi = 3.14 is built into MATLAB, as are the sin function and hundreds of other functions. When you entered each of the preceding lines, MATLAB stored the results in a variable called ans for answer. The value of ans was then displayed. The last line should have produced the square root of 2. We can manipulate ans to find out


≫ ans^2

The new answer is very close to 2, as expected. Let's see what the roundoff error is:


≫ ans-2

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