Change_var Class Reference
[General PDE solvers (under development)]

This class defines a variable change to be used when solving elliptic equations. More...

#include <change_var.h>

Public Member Functions
	Change_var (int var)
	Additive factor for F ## PROVISORY.
	Change_var (int var, double)
	Standard constructor.
	Change_var (int var, double, double)
	Standard constructor.
	Change_var (const Change_var &so)
	~Change_var ()
	Constructor by copy.
double	val_F (double x)
	Standard destructor.
double	val_der_F (double x)
	Returns the value of at { x}.
double	val_G (double x)
	Returns the value of at { x}.
double	val_der_G (double x)
	Returns the value of at { x}.
Protected Attributes
double(*	func_F )(double)
double(*	der_F )(double)
	Pointer on the function .
double(*	func_G )(double)
	Pointer on the derivative of .
double(*	der_G )(double)
	Pointer on the function .
double	mult_F
	Pointer on the derivative of .
double	add_F
	Multiplicative factor for F ## PROVISORY.

Detailed Description

This class defines a variable change to be used when solving elliptic equations.

In {one particular domain}, the change is defined as follows : ()

$W = F\left(r\right) + G \left(r\right) w$

where $W$ is the usual variable, i.e. the one that is $\mathcal{C}^1$ and $w$ is the variable used for solving the elliptic equation. The functions $F$ and $G$ are arbitrary functions of $r$ . The type of change must be explicitely implemented in the constructor for { Change_var}.

Definition at line 94 of file change_var.h.

Constructor & Destructor Documentation

Change_var::Change_var ( int var )

Additive factor for F ## PROVISORY.

Standard constructor. Case with without parameter. { var} defines explicitely the type of variable to be used. Are currently implemented : {itemize} { var} $= {\rm STD} \Longrightarrow F=0 \, \& \, G=1$ . { var} $= {\rm W\_BETA} \Longrightarrow F=1 \, \& \, G = r$ . { var} $= {\rm W\_BETA\_INF} \Longrightarrow F = 1+ \frac{1}{3}r^2\ln r \, \& \, G = r$ . { var} $= {\rm H\_BETA} \Longrightarrow F=1 \, \&\, G=1$ . { var} $= {\rm LAMBDA_RN} \Longrightarrow F=-\ln r \, \& \, G=1$ . { var} $= {\rm NU_RN} \Longrightarrow F=\ln r \, \& \, G=1$ . {itemize}