Why is plot using range of values with increments not proper?
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Laxman Chinnannavar
on 4 Jan 2022
Commented: Laxman Chinnannavar
on 4 Jan 2022
I am a begginer using matlab for college lab. I am trying to experiment with the range with increment operation and I notice some weird output.
When I use greater increment values the output starts becoming wrong but when i use smaller increment values the output become correct. I have attached the code below and their respective outputs for reference
F = 2000;
t = 0.99:0.001:1;
x = sin(2*pi*F*t);
plot(t,x);
In the above code, in the y axis output the values go above the normal sine range [-1,1]
F = 2000;
t = 0.999:0.00001:1;
x = sin(2*pi*F*t);
plot(t,x);
While for this code the output works percectly.
Could anyone please give an insight in this?
Thank you
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Accepted Answer
DGM
on 4 Jan 2022
Edited: DGM
on 4 Jan 2022
"In the above code, in the y axis output the values go above the normal sine range [-1,1] "
No they don't. Look at the labels again. All of those values are close to zero. It's just a matter of aliasing. There are only 11 samples.
F = 2000;
t = 0.99:0.001:1;
x = sin(2*pi*F*t);
plot(t,x,'*'); hold on;
% plot the exact same thing with more points
t = linspace(0.99,1,1000);
x = sin(2*pi*F*t);
plot(t,x);
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