Logical values in MATLAB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Logical AND operation output

What is the output of the following MATLAB code?

MATLAB

a = true;
b = false;
c = a && b;
disp(c);

A 1

B true false

C 0

D Error: Undefined function or variable 'c'.

💡 Hint

Remember that logical AND returns true only if both inputs are true.

The logical AND (&&) returns true only if both operands are true. Here, a is true but b is false, so c is false, which MATLAB displays as 0.

❓ Predict Output

intermediate

Logical indexing with arrays

What will be the output of this MATLAB code?

MATLAB

x = [3, 7, 2, 9, 5];
idx = x > 5;
disp(x(idx));

A [3 2 5]

B [7 9]

C [7 9 5]

D Error: Index exceeds matrix dimensions.

💡 Hint

Logical indexing selects elements where the condition is true.

The condition x > 5 is true for elements 7 and 9 only, so x(idx) returns [7 9].

❓ Predict Output

advanced

Logical NOT with numeric values

What is the output of this MATLAB code snippet?

MATLAB

a = 0;
b = ~a;
disp(b);

A 1

B 0

C Error: Invalid use of operator '~'.

D Logical false

💡 Hint

In MATLAB, zero is treated as false and nonzero as true for logical operations.

The ~ operator negates the logical value. Since a is 0 (false), ~a is true, displayed as 1.

❓ Predict Output

advanced

Logical OR with mixed logical and numeric

What will this MATLAB code output?

MATLAB

x = true;
y = 0;
z = x || y;
disp(z);

A 1

B 0

C Error: Operands must be convertible to logical scalar values.

D true false

💡 Hint

Logical OR returns true if either operand is true.

x is true, y is 0 (false). Logical OR (||) returns true (1) if either operand is true.

❓ Predict Output

expert

Logical array operations with element-wise AND

What is the output of this MATLAB code?

MATLAB

a = [true false true];
b = [false true true];
c = a & b;
disp(c);

A [0 0 1]

B [1 1 1]

C [false true true]

D [false false true]

💡 Hint

The & operator performs element-wise logical AND.

Element-wise AND compares each element: true & false = false, false & true = false, true & true = true, so c is [false false true], displayed as [0 0 1].