General MCQ Flashcards

In MATLAB, what is the default data type for numeric values?

Answer: double

MATLAB stores numeric values as double-precision floating-point (double) by default unless explicitly specified otherwise.

Which function would you use to plot a function y = sin(x) over the range [0, 2π] in MATLAB?

Answer: x = 0:pi/100:2*pi; plot(x, sin(x))

You must first define a vector x with the desired range, then pass both x and sin(x) to the plot() function.

What does 'NaN' represent in MATLAB?

Answer: Not a Number — an undefined or unrepresentable value

NaN stands for Not a Number and results from undefined operations like 0/0 or Inf - Inf.

How do you suppress output in MATLAB when executing a command?

Answer: Add a semicolon (;) at the end

Appending a semicolon at the end of a statement suppresses the automatic display of its result in the Command Window.

Which MATLAB function computes the Fast Fourier Transform of a signal?

Answer: fft(x)

fft(x) computes the discrete Fourier transform of vector x using the Fast Fourier Transform algorithm.

What is the result of the MATLAB expression: [1 2 3] + [4; 5; 6]?

Answer: A 3×3 matrix via broadcasting

In MATLAB R2016b+, implicit expansion (broadcasting) allows a 1×3 row vector and a 3×1 column vector to be added, producing a 3×3 matrix.

Which MATLAB function saves workspace variables to a .mat file?

Answer: save('file.mat')

The save function writes workspace variables to a binary .mat file, which can later be loaded with the load function.