plotting a periodic signal.

How to plot a given signal e.g.

   x(n)=cos(pie*n/2)-sin(pie*n/8)+3cos(n*pie/4+pie/3)

in such a way that plotting proves its periodicity??

[Walter Roberson]

http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags

Answer 1

[Shashank Prasanna]

Student, this is simple plotting in MATLAB. Take a look at the documentation:

http://www.mathworks.com/help/matlab/ref/plot.html

If this is an assignment problem and you have more of these to solve, it would help to invest some time on the getting started section of MATLAB:

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

Answer 2

[Walter Roberson]

No, you cannot prove something has infinitely extending properties just by examining any finite subset of it. Try, for example, plotting in the area of n = 10^100