Home » Matlab | Electrical Engineering homework help

Matlab | Electrical Engineering homework help

MATLAB Project 1

1. In this problem, you will use MATLAB to generate and plot the discrete-time signal δ[n] and unit step function u[n]. MATLAB provides two built-in functions that will be useful. The call zeros(m,n) returns an array of zeros with m rows and n columns. Similarly, ones(m,n) returns an m × narray of ones. 

Our first problem is that MATLAB array indexing starts at one, but for plotting δ[n] and u[n] we will want to have the time variable n start at some negative integer. So we will have to use one array (call it n) to hold the values of n and another array to hold the values of the signal. 

Consider the following MATLAB code which generates the signal δ[n] and plots it: 

% generate the signal delta[n] and plot it


n = -10:10;          % values of the time variable

delta_n = [zeros(1,10) 1 zeros(1,10)];



title(‘Unit Impulse Function’);

xlabel(‘Time index n’);


a) Run the sample code and submit the figure.b) Modify the code and plot δ[n-2] for n from -10 to 10.c) Use zeros and ones in MATLAB to graph u[n] for n from -10 to 10.d) Graph u[-n-3] for n from -10 to 10.

2. Consider the following MATLAB code, which generates a discrete-time cosine signal x[n] and plots it: 

%generate and plot a discrete-time cosine signal

n = 0:40;                       %values of the time variable

w = 0.1*2*pi;    %frequency of the sinusoid.

phi = 0;     %phase

A = 1.5;                        %amplitude

xn = A * cos(w*n – phi);


axis([0 40 -2 2]);


title(‘Discrete Time Sinusoid’);

xlabel(‘Time index n’);


a) Run the sample code and submit the figure.b) What is the length of the signal x[n]? c) What is the fundamental period of x[n]? d) What is the purpose of the grid?e) Modify the code so that it generates a sinusoid with length 50, frequency 0.4 × 2π radians per sample, amplitude 2.5, and a phase offset of π/2 radians. Run the modified code to generate and plot another discrete-time sinusoid.

3. Sample MATLAB code for two subplots as follows:


w=[-29 -3];

for ii=1:2




   title([num2str(w(ii)) ‘pi/8’]);


a) Generate subplot for x[n] = sin(wt) with different w:

for n from 0 to 63.

b) Label each graph with the frequency.c) Use the subplot function to plot four graphs per figure. d) Are some subplots identical to others? Or find out the relationship.


(a) generate and plot the discrete-time signal x[n] = cos(0.09n) for 0 ≤ n ≤ 120. For your plot, turn the grid on and scale the axes using the MATLAB statements 

axis([0 120 -1.0 1.0]);


(b) Is this signal periodic? Explain. 

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
The price is based on these factors:
Academic level
Number of pages
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more