how can i create an endlesse animation of sine wave

hi friends,

how can i write a matlab script wich creates an endeless animation of sine wave whose amplitudes varies from on to zero then from zero to one and so on. The frequency of the sine wave is 10Hz, th length of the time support for the plot must be one seconde, and i should try different pause times.

thanks in advance.

Answer 1

[Walter Roberson]

http://uk.mathworks.com/matlabcentral/answers/262796-i-would-like-to-view-code-that-i-can-type-in-order-to-simulate-all-harmonics-of-a-simple-sine-wave-w#answer_205257

You would adjust the parameters at the very top of the code, and you would change the "for" to produce values for H0 instead of H1, and you would comment out the assignment of H1 into f()

[Mourchid]

thank you Mr.Walter, i have just a litte question, how can i vary the amplitude in this code ??

[Walter Roberson]

The "for" loop is varying the amplitude. In that particular code, the loop is varying the amplitude of H1 between 0 and 5 over 100 points (linspace defaults to 100 points)

The code there leaves the y axis automatically scaling. You might want to set the axes ylimmode to manual, such as

   set(gca, 'ylim', [-1 1]/10000, 'ylimmode', 'manual')

before doing the first plot.

[Mourchid]

Thanks a lot Mr.Walter for your answer, i have juste a little question, if frequency varies linearly over time between 0Hz and 200Hz, with a frequency steps size equal to 5Hz and the length of the time support for the plot must be one second, how can i create this endlesse animation of a sine wave with different pause times??

[Walter Roberson]

In the code in that posting, I always assign to the same index locations in the array f as that task involved constant frequencies. For the frequency to vary over time, you would assign to different locations in f.

If you want different pause times then change the pause() call to reflect the time you want to pause.