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Matlab help with discrete time signal

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Joshua A
Joshua A 2012-7-4
For discrete time signal...x(n)=ka^n{u(n)-u(n-5)}....x(n)=341...x(0)=10...signal has positive and negative values
Is there a way to determine constants 'k' and 'a' and plot x(n) within Matlab? Or is it necessary to find constants and plot x(n)? If so how? I have looked through help menus and can not find any way to make it work, but I am also new to Matlab.
Thank you,
Josh

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Rohan Kale
Rohan Kale 2012-7-5
编辑：Rohan Kale 2012-7-5
since your sequence is { ka,ka^2,ka^3,ka^4} which is {x(1) x(2) x(3) x(4) } and the sequence weights are known. hence your a= x(2)/x(1) and k=(x(1)^2)/x(2). for plotting just do stem(n,x); and if you want to plot the same with the expression ka^n just write this => n=-10:10; x=k*(a.^n).*[n>=0 & n<5]; you can change the range of 'n' per your requirement.

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