Trying to plot a sine wave, getting a straight line.

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Nat 2018-2-8

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评论： Nat 2018-2-9

I need to create a time series using x(n)=sin(2pi/N)*n where N=256 and plot the amplitude. I keep getting a straight line instead of a sine wave. Any pointers?

    %Create time series x(n)
N=256;
x=zeros(N,1); %allocate space
for n=1:N;
    x(n)=sin((2*pi)/N)*n;
end 
%Plot x(n)
figure(1)
n=0:255;
plot(n,x(1:N))
xlim([0 255])
ylim([-120 120])
xlabel('n')
ylabel('Amplitude')
title('x(n)'

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Answer 1

Roger Stafford 2018-2-9

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You have placed your ’n’ variable outside the parentheses for the sine function. That would make it a straight line. It should be this to get a sine curve:

x(n)=sin(2*pi/N*n);