matlab coding for graph

manifolds · Jul 27, 2005

complicated matlab graph

here is my problem

let say i want to plot function y=sinx. (this is just for example, of course the real case is much more complicated)
so in matlab i write plot y.
and now i want to have the period of the graph. (we know in this case the period is 2 pi).
how can i get that?
is there any command for that?
getperiod? hehe..i know no such thing rite? heheh..

help2!

checkmate · Jul 27, 2005

You can do a FFT on y and find out the dominant spectral component.

manifolds · Jul 27, 2005

what is FFT? is it Fast Fourier Transform? how to do that in matlab nway?

echo47 · Jul 27, 2005

Period of the graph? Do you mean the period of the waveform, or the min-to-max span of the graph's x axis?

FFT is a good way to estimate frequency. Type help fft

Here's a really easy way to plot a sine wave:
ezplot('sin')

checkmate · Jul 27, 2005

manifolds said:
what is FFT? is it Fast Fourier Transform? how to do that in matlab nway?

FFT gives you the spectrum of your signal, which is the range of frequencies found in your signal. If you find the spectrum of a pure sinusoidal signal, you would get an impulse in its spectrum at the specified frequency.
https://www.mathworks.com/access/helpdesk/help/techdoc/ref/fft.html

matlab coding for graph

manifolds

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