0 个投票

Hello, I'm new to matlab. I kind of like it and i have a project at university based on matlab. I'm kind of bad at programming but i want to learn.
So i have the following exercise to solve:
I need to make a square signal on multiple levels.
The period of every signal is 0.25 s and i have the following levels:
a) {-1,1}
b) {-3,-1,1,3}
c) {-5,-3,-1,1,3,5}
d){-7,-5,-3,-1,1,3,5,7}
I m sorry if this aren't the rules of the website but i'm kind of desperate. If someone can solve the d) {-7,-5,-3,-1,1,3,5,7} so i can inspire from that.

6 个评论
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darova
darova 2019-10-31
Can you make a simple drawing of result you expect?
Liviu Iftime
Liviu Iftime 2019-10-31
The problem says is the signal is random.
Liviu Iftime
Liviu Iftime 2019-10-31
t= 0:0.002:5;
n=125;% n=0.25/0.002
v=randn(1,20);k=1;s=[0 0];
for p=1:length(v)
if v(1,p)<0
v(1,p)=-1;
else v(1,p)=1;
end
end
for i=1:20
for j=1:125
s(1,k) = v(1,i);
k=k+1;
end
end
s(1,k)=v(1,i);
plot(t,s)
I have done this, and i think it s ok, but i m stucked at b)
darova
darova 2019-10-31
  • I need to make a square signal on multiple levels.
What does it mean? HOw it should look like?

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 采纳的回答

Shubham Gupta
Shubham Gupta 2019-11-1

0 个投票

Below code worked for me :
rng default
tsim = 0:0.002:10; % simulation time
Amp = {-7,-5,-3,-1,1,3,5,7}; % Amplitudes
dt = 0.25; % sample time
randAmp = [Amp{floor(length(Amp)*rand(tsim(end)/dt,1))'+1}]; % randomize amplitude over simulation time
func = @(t)0; % initialize function
for i = 1:length(randAmp)
func = @(t)func(t)+((t-dt*(i-1))*(t-(dt-1e-10)*i)<=0)*randAmp(i); % check where 't' lies and decide amplitude accordingly
end
plot(tsim,arrayfun(func,tsim)) % plot the results
Let me know if you have doubts !

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Liviu Iftime
Liviu Iftime 2019-11-1
Well Thank you! I'm kind of confussed on what is that. I have managed to make myself the code and it has 140 lines. It's funny that you have in your code 10 lines, but as i said I have no ideea what is that code.
THANK YOU ANYWAYS!
Shubham Gupta
Shubham Gupta 2019-11-3
I am glad I could help. If you can tell me which part of the code you didn't understand, maybe I can help you understand in more detail. Also if it solves the problem for you, you can consider to accept the answer cheers !

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