25.3 Interpolation Types

The interpolation library provides five interpolation types:

Interpolation Type: gsl_interp_linear

Linear interpolation. This interpolation method does not require any additional memory.

Interpolation Type: gsl_interp_cspline

Cubic spline with natural boundary conditions

Interpolation Type: gsl_interp_cspline_periodic

Cubic spline with periodic boundary conditions

Interpolation Type: gsl_interp_akima

Akima spline with natural boundary conditions

Interpolation Type: gsl_interp_akima_periodic

Akima spline with periodic boundary conditions

The following related functions are available,

Function: const char * gsl_interp_name (const gsl_interp * interp)

This function returns the name of the interpolation type used by interp. For example,

printf("interp uses '%s' interpolation\n", gsl_interp_name (interp));

would print something like,

interp uses 'cspline' interpolation.

Function: unsigned int gsl_interp_min_size (const gsl_interp * interp)

This function returns the minimum number of points required by the interpolation type of interp. For example, cubic interpolation requires a minimum of 3 points.