logspace

Interval of logarithmicly equidistant points (geometric serie).

Namespace: dsp

Prototype

static Vecf logspace(float a, float b, int n)

Parameters

a	Logarithm (base 10) of the initial point
b	Logarithm (base 10) of the final point
n	Number of points

Returns

Geometric serie

Description

Computes \(n\) points logarithmicly equidistants between \(a\) and \(b\), that is, the following geometric serie:

\[ x_k = 10^{a + k \frac{b-a}{n-1}},\quad k = 0,\dots,n-1 \]

Example

  // 5 points entre 1=10^0 et et 100=10^2
  soit x = logspace(0, 2, 5);

  Figure f;
  f.plot(x, "r-o");

  // Axe vertical : affichage logarithmique
  f.axes().def_echelle("lin", "log");