plotting a periodic signal.
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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??
回答（2 个）
Shashank Prasanna
2013-8-28
0 个投票
Student, this is simple plotting in MATLAB. Take a look at the documentation:
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:
Walter Roberson
2013-8-28
0 个投票
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
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