How to calculate and plot sin functions?

Hello I am a Matlab begginer user. I am trying to calculate and plot the function of a damped sine-wave and the dynamic range (envelope). However, I can not find the right set of code to make the problem run.

This is the equation I am working on:

f(t)=80.^((-1/80)*(t))*sin(0.25*(t)+(pi/3))

I have defined t as t = 100 % seconds

Any help will be welcome.

Thank you

Answer 1

[Stephen23]

MATLAB works (primarily) with numeric arrays, thus the name "MATrix LABoratory". You need to first create a vector of (numeric) time values, and then perform your operations on it like this:

>> t = 0:0.1:100; 
>> s = 80.^(-t/80) .* sin(0.25*t+pi/3);
>> plot(t,s)

These tutorials are highly recommended for all beginners, and introduce many useful aspects of both understanding and using MATLAB:

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html

[Nicolas Sarmiento Sierra]

Dear Mr Cobeldick.

Thank you for you answer.

I have understood the concept so far. However, I might now be able to plot in via Simulink and obtain a graphic in the next fashion:

I suppose this result can be plot by opening the Simulink library and selecting the proper symbols of the sinwave.

Any further recommendation is welcome.

I have completed your recommended tutorials.

Thank you