MathGroup Archive 2001

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Fourier coefficients

  • To: mathgroup at
  • Subject: [mg30722] Re: Fourier coefficients
  • From: peter weijnitz <pewei at>
  • Date: Sat, 8 Sep 2001 02:56:01 -0400 (EDT)
  • References: <9nam4o$nq5$>
  • Sender: owner-wri-mathgroup at

try this to find the fourier coefficient for freq f:

f[freq_] :=
    Fit[data, {Cos[2 Pi t], Sin[2 Pi t]}, t] /.  a_ Cos[_] + b_  Sin[_]
-> {a, b}

a and b will be the coefficients of the cos and sin them respectively
data is your data vector, (a benefit with this method is that data need
not to be evenly spaced)
e.g. f[2000] gives the coeff's for frequency 2000 Hz

Heidenreich wrote:

> Hello,
> How can I get the sin and cos fourier coefficients from a list? (The
> list has measurements values with the quantity of 100)
> Dirk

  • Prev by Date: Trigonometry, sine theorem.
  • Next by Date: Assumptions about variables
  • Previous by thread: Fourier coefficients
  • Next by thread: Fitting to complex values