plotting a periodic signal.

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Student
Student 2013-8-28
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??

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回答（2 个）

Shashank Prasanna
Shashank Prasanna 2013-8-28
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
Walter Roberson
Walter Roberson 2013-8-28
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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