&GAS: INTERPOLATIONS

item

The table item for which you wish to alter the interpolation method.

Keyword	Meaning
`ATTACHMENT-COEFFICIENT`	Attachment coefficient of electrons
`DIFFUSION-TENSOR`	Diffusion tensor components
`DRIFT-VELOCITY`	Electron drift velocity
`EXCITATION-RATES`	Individual gas excitation rates
`ION-DISSOCIATION`	Ion dissociation coefficient
`ION-MOBILITY`	Ion mobility
`IONISATION-RATES`	Individual gas excitation rates
`LONGITUDINAL-DIFFUSION`	Longitudinal diffusion of electrons
`LORENTZ-ANGLE`	Lorentz angle of electrons
`TOWNSEND-COEFFICIENT`	Townsend coefficient of electrons
`TRANSVERSE-DIFFUSION`	Transverse diffusion of electrons

method

The interpolation method to be used. The basic choice is between cubic splines and polynomial Newton interpolation.

Spline interpolation leads to smooth looking graphs, but tends to oscillate making the method less suited for numerical calculations. Spline interpolation can not be used on the 2-dimensional gas tables that are produced by programs like Magboltz when a magnetic field is present.

The order of polynomial interpolation must be between 1 and the smallest of the two numbers: 10 and number of table entries - 1. Orders larger than 2 are not recommended.

Formats:

INTERPOLATIONS item SPLINES
INTERPOLATIONS item NEWTON order

Method	Effect	Use
`SPLINES`	Cubic spline interpolation	only 1-D
`NEWTON n`	Polynomial interpolation of order n	1-D or 2-D
`LINEAR`	Linear interpolation (= NEWTON 1)	1-D or 2-D
`QUADRATIC`	Parabolic interpolation (=NEWTON 2)	1-D or 2-D
`CUBIC`	Cubic interpolation (=NEWTON 3)	1-D or 2-D

Go to the top level, to &GAS, to INTERPOLATIONS, to the topic index, to the table of contents, or to the full text.

Formatted on 21/01/18 at 16:55.