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Subsection Logical Values (Answers)
MATLAB has two logical values:
true and
false. When displayed, they often appear as
logical 1 and
logical 0. Although they behave similarly to the numeric values
1 and
0, they are different data types. Just as numbers can be stored in variables, logical values can be stored in variables as well.
a = 1;
b = true;
c = 0;
d = false;
fprintf("a = %g, b = %g, c = %g, d = %g\n", a, b, c, d)
Running the above code,
fprintf produces the following output:
a = 1, b = 1, c = 0, d = 0
Even though
a and
b (and
c and
d) look the same, MATLAB treats them differently:
a is a number (a double), while
b is a logical value. You can get more information using the
whos command. Here is the output you should see:
Name Size Bytes Class Attributes
a 1x1 8 double
b 1x1 1 logical
c 1x1 8 double
d 1x1 1 logical
This shows us two differences:
Class (data type)
a is a
double, while
b is a
logical.
Bytes (memory usage)
a uses 8 bytes, while
b uses 1 byte.
At the end of the day, the double data type is meant to store numeric quantities, while the logical data type stores yes/no answers to questions.
