TABLE OF CONTENTS The objectives of this chapter are to enable you to:
Understand logical operators more fully.
And to introduce you to:
Logical vectors and how to use them effectively in a number of applications.
Logical functions.
This chapter introduces a most powerful and elegant feature of MATLAB, viz., the logical vectors. The topic is so useful and, hence, important that it deserves a chapter of its own.
Try these exercises on the command line:
Enter the following statements:
r = 1;r <= 0.5 % no semicolon
If you correctly left out the semicolon after the second statement you will have noticed that it returned the value 0.
Now enter the expression r >= 0.5 (again, no semicolon). It should return the value 1. Note that we already saw in Chapter 2 that a logical expression in MATLAB involving only scalars returns a value of 0 if it is FALSE, and 1 if it is TRUE.
Enter the following statements:
r = 1:5;r <= 3
Now the logical expression r <= 3 (where r is a vector) returns a vector:
1 1 1 0 0
Can you see how to interpret this result? For each element of r for which r <= 3 is true, 1 is returned; otherwise 0 is returned. Now enter r == 4. Can you see...
