[Date Index]
[Thread Index]
[Author Index]
Help with plotting Fourier representations
*To*: mathgroup at smc.vnet.net
*Subject*: [mg54225] Help with plotting Fourier representations
*From*: "Diana" <diana53xiii at earthlink.remove13.net>
*Date*: Sun, 13 Feb 2005 22:17:13 -0500 (EST)
*Reply-to*: "Diana" <diana53xiii at earthlink.remove13.net>
*Sender*: owner-wri-mathgroup at wolfram.com
Folks,
I would like help with plotting the following problem with Mathematica. You
will see my basic attempts as follows:
First, find the Fourier series of the periodic function:
f(x+4) = f(x) for all x, defined by:
f(x) = -1 if -2<x<0
f(x) = 1 if 0<x<2
Since this is an odd function, we can just calculate the b_n's.
So, I calculated the following:
b[n_]:= (1/L) Integral (from 0 to L) of Sin[(n Pi t)/L]dt + (1/L) Integral
(from L to 2L) of -Sin[(n Pi t)/L]dt
g[x_]:= Summation as goes from 1 to 5 of b[n] Sin[n x]/:0 <= x <=2 L
g[x_]:= g[Mod[x,2 L]]
gtable=Table[g[n], {n, -8, 8, .1}];
ListPlot[gtable];
There must be a better way to do this, where the coordinates of the x and y
axes show up, at the least.
Thanks in advance for your help,
Diana
--
=====================================================
"God made the integers, all else is the work of man."
L. Kronecker, Jahresber. DMV 2, S. 19.
Prev by Date:
**Using Select with arrays? (Relative newbie)**
Next by Date:
**Re: Re: Problem using Evaluate[] inside a Plot command. 5.1**
Previous by thread:
**Re: Using Select with arrays? (Relative newbie)**
Next by thread:
**Perplexed by the behavior of NonlinearFit in Mathematica ver 4.2 vs 5.1**
| |