I need Code for Fourier series coefficients

I need to know how to find fourier series coefficients for given graph.

and after finding coefficients . Plot graph and then Increase number of Coefficients an plot again. And use fftshift to centralize DC component.

[Walter Roberson]

That sounds like homework.

What does it mean to increase the number of coefficients? The fourier series is an infinite series, and in particular triangle waves need the full infinite series, so you are not going to ever finish the first part of the assignment to get to the part where you increase the number of coefficients from one infinity to a somehow greater infinity.

[Ayesha Latif]

Like First if we take 10 coefficients to plot the graph. Then we take 20 coefficients to plot the graph and check whether their is improvement in signal by increasing the number of coefficients to plot the graph

[Walter Roberson]

Is it okay to find the coefficients numerically? If so then see fft() and its optional second argument.

[Ayesha Latif]

we can find the coefficients by the equation.

How we can plot the graph for the coefficients. like if we first take 3 coefficients then 5 etc.