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Subsection Negating Logical Statements
To ask the opposite of a logical statement, use the NOT operator
~. If an expression is true, its negation is false, and vice versa.
~true % returns false
~false % returns true
The NOT operator negates a single logical value or statement. When the statement is a comparison, use parentheses so MATLAB negates the whole comparison.
For example, the following statements ask if “8 is not equal to 9”:
Similarly, the negation of x >= 5 is x < 5, so the two statements are equivalent:
When negating expressions, use parentheses to make your intent clear and improve the readability of your code.
Checkpoint 22 . Negating Logical Statements.
Which of the following expressions correctly asks "Is
x NOT greater than 10?" Select all that apply.
~(x > 10)
Correct! This uses the NOT operator to negate the comparison.
x <= 10
Correct! This is the equivalent relational operator form without negation.
~x > 10
Incorrect. Without parentheses, this negates x first, then compares the result to 10, which is not the intended meaning.
x < 10
Incorrect. This asks if x is strictly less than 10, which excludes the case where x equals 10.
