05_Numerics

Numerics Package

Provides mathematical and numerical utilities, such as:

• Functions and function parsing
• FFT (fast Fourier transform)
• Root finding (Newton’s method, bisection, etc.)
• Integration (Riemann, Simpson, etc.)
• Polynomials

---

Key Classes

Function & Parser

• Function: an interface representing a mathematical function f(x).
• ParsedFunction: parse a string like "x^2 + sin(x)" into an executable function.

FFT (Fast Fourier Transform)

• Found in org.opensourcephysics.numerics.FFT.
• Usage for forward/backward transforms on arrays, e.g.

  FFT fft = new FFT(N);
  fft.transform(realPart, imagPart);