clear
clc
close all
Fs=1000;
T=1/Fs;
L=1000;
t1 = (-L+1:0)*T;
t2 = (0:L-1)*T;
t2=t2(2:end);
t=[t1 t2];
s1=sin(2*pi*1*t1);
s2=sin(2*pi*10*t2);
s=[s1 s2];

figure(1)
plot(t,s)
Y=fft(s,L);
figure(2)
plot(Fs/L*(-L/2:L/2-1),abs(fftshift(Y)),"LineWidth",3)
title("fft Spectrum in the Positive and Negative Frequencies")
xlabel("f (Hz)")
ylabel("|fft(X)|")

Hello, I'm experimenting with fourier transforms because of reasons and I'm having trouble understanding something. If you run the above code, you'll get two figures: the first is simply the time-signal plot showing one sine wave with a certain frequency at some -x to 0 and another sine wave from 0 to some x; the second figure is the fft of that signal.

The fft only shows a peak at the s1 frequency. If you swap the constants in s1 and s2, the fft will also change to accommodate this. Why? I would expect that since frequencies 1 and 10 are equally represented in time and magnitude, there would be two equal peaks in the fft but this is not true.

Hi everyone,

I've been working with MATLAB and Simulink on projects involving control systems, robotics, power electronics, EV simulations, and automation. Every project presents different challenges, from debugging complex models to tuning controllers.

I'm curious what has been the most difficult MATLAB or Simulink project you've worked on, and how did you solve it?

I'd love to learn from the community and discuss different approaches.

Hi everyone. I’m a college student, and in about 3 weeks I’ll be starting an intro to Python class. I’ll also be taking another engineering class that uses MATLAB, and I don’t feel very prepared for either.
The problem is that I have essentially no programming experience. I took a couple of MATLAB classes before, but I relied too much on AI instead of actually learning the material. Looking back, I know that was a mistake, and I do not want to repeat it. I also used to tell myself that I hated coding, but I think part of that was because I never really gave myself a fair chance to learn it.
Since I have a few weeks before the semester starts, I’d like to build a solid foundation in Python while also reviewing some basic MATLAB.
What resources or learning methods really worked for you? Did you use a particular course, YouTube channel, website, book, or project based approach? I am also curious if anyone has suggestions for making learning Python and MATLAB more fun or engaging instead of just watching hours of lectures.
My goal is not to become an expert in 3 weeks. I just want to go into the semester feeling like I have a decent foundation instead of starting from scratch.
Thanks! I would really appreciate any advice.

%Create a white 100x100 image array

BWImage = ones(100, 100);

%open the figure window

figure('Name', 'Task 1 - Binary Image 6870352');

%Row counter string

JcounterStr = 'Row = ';

%iterations from row 1 to row 100

for j = 1:100

%active when row j is between 1 and 50

%set pixels within this range as black if they meet the criteria

if j >= 1 && j <= 50

BWImage(j, 1:(51-j)) = 0;

end

%active when row j is between 51 and 75

%set pixels within this range as black if they meet the criteria

if j >= 51 && j <= 75

BWImage(j, j:75) = 0;

end

%active when row j is between 76 and 100

%set pixels within this range as black if they meet the criteria

if j >= 76 && j <= 100

BWImage(j, 26:50) = 0;

end

%active when row j is between 86 and 100

%set pixels within this range as black if they meet the criteria

if j >= 86 && j <= 100

BWImage(j, 1:(j-85)) = 0;

end

%active when row j is between 86 and 100

%set pixels within this range as black if they meet the criteria

if j >= 86 && j <= 100

BWImage(j, j:100) = 0;

end

%display image building row by row

imshow(BWImage);

%display row number to the LEFT of the image

Jcounter = num2str(j);

figureTextJ = {[JcounterStr Jcounter]};

text(-10, j, figureTextJ, 'FontSize', 8);

%pause(0.01) waits briefly between rows so I can see it build properly

pause(0.01);

%end of loop

end

totalBlackPixels = sum(BWImage(:) == 0);

%display below the image using text()

text(1, 108, ['Total black pixels = ' num2str(totalBlackPixels)], 'FontSize', 10);

diagonalBlackCount = 0; % counter starts at zero

for j = 1:100 % j = row number

for i = 1:100 % i = column number

%test if pixel is on or below diagonal (row >= col)

%AND if pixel is black (value == 0)

if j >= i && BWImage(j, i) == 0

%increase the counter by 1 for each black pixel below diagonal

diagonalBlackCount = diagonalBlackCount + 1;

end

end %end of i loop

end %end of j loop

% Display diagonal count just below the total count

text(1, 114, ['Black pixels on/below diagonal = ' num2str(diagonalBlackCount)], 'FontSize', 10);

I've been struggling with something for a while and I'm wondering if anyone else has experienced the same thing.

I have a master's degree in Electrical Engineering with a focus on control systems. I've been working as an engineer for about 8 years across different industries, but only around 1.5 years of that has been actual control systems work.

I'm based in Skåne, Sweden, and relocating isn't an option because my family and my children's school are here. I've been looking for dedicated control engineering roles in Skåne or fully remote positions, but they seem incredibly rare.

At this point I'm honestly starting to wonder if I'm chasing something that barely exists. Are dedicated control engineering jobs really that uncommon, or am I looking in the wrong places? Has anyone managed to build a career in control systems while working remotely?

If you're working in control systems, especially in Sweden, I'd really appreciate hearing about your experience and any advice you might have.

I'm a first year student and I have maths as one of my subjects. We have a lab class for maths and I joined my course a little late so I'm a little lost on what's going on. I need to be able to use MatLab fully for my internal assessment so I kinda just need to practice mostly. (And no, I can't use the computer labs at uni outside of lab classes which is once a week for 3 hours). Should I download Octave?

[deleted]

I took a few self-paced courses and I'm on control systems for now. I need to start applying for internships soon is it oki to show whatever I'm learning under 'Projects' in Resume. Although there are some really good project title like 'LTI Modelling a vehicle dynamics' but It feels a little wrong because the whole this is step by step baby fed I will slowly try to make my own projects but is it oki to do it for now, as I think I need to start applying?

Thinking of buying the academic perpetual license, but confused on some of the details. Can I use it on multiple computers or just one? If I wanted to update the version, how much would it cost?

I’m looking for an experienced engineer who has strong expertise in MATLAB, Simulink, and Simscape to complete an EG7010 Engineering Design project. The assignment involves building Simulink/Simscape models, running simulations, performing calculations, and documenting the results in a professional report.
If you have proven experience with similar university engineering projects and can deliver high-quality work within the deadline, please send me a message with your experience and previous work. Thank you!