MATLAB Programming

Logical Types
Logical Types
The logical data type represents a logical true or false state using the
numbers 1 and 0, respectively. Certain MATLAB functions and operators
return logical true or false to indicate whether a certain condition was found
to be true or not. For example, the statement (5 * 10) > 40 returns a logical
true value.
Logical data does not have to be scalar; MATLAB supports arrays of logical
values as well. For example, the following statement returns a vector of
logicals indicating false for the first two elements and true for the last three:
[30 40 50 60 70] > 40
ans =
0 0 1 1 1
This section covers the following topics:
• “Creating a Logical Array” on page 2-33
• “How Logical Arrays Are Used” on page 2-35
• “Identifying Logical Arrays” on page 2-37
Creating a Logical Array
One way of creating an array of logicals is to just enter a true or false value
for each element. The true function returns logical one; the false function
returns logical zero:
x = [true, true, false, true, false];
Logical OperationsonanArray
Youcanalsoperformsomelogicaloperationonanarraythatyieldsanarray
of logicals:
x = magic(4) >= 9
x =
1 0 0 1
0 1 1 0
2-33