how to define a sinusoid function over a specific range

Hi all,

I wonder how to define sin function over a specific range of n. For example, n=1:20 and

x= sin(pi*n) over 0<n<5 and 0 elsewhere.

it should be modified in a way so that I can time shift it or scale it

Thanks

[Adam]

Just calculate it up to 5 and then append 0s to the end.

Answer 1

[Sven]

 f = 10; % Frequency in Hertz
 a = 2;  % Amplitude
 startTime = 0; % Time in seconds
 endTime = 10;  % Time in seconds
 samples = 100; % Number of samples

 x = linspace(startTime,endTime,samples);
 y = a*sin(2*pi*f*x);

 plot(x,y)

linspace produces a vector with evenly spaced points between startTime and endTime. If you work with radians, just delete the 2*pi inside the sine function.

[Romio]

Thank you. But what I wanted was a conditional function that is defined over all the values of n, though it is zero for n>5 I intend to use it as an input to a system and modify by time shifting or scaling