Vcap class

Collection of routines which cap certain exponential and hyperbolic functions. More...

Files
file	vcap.h
	Contains declarations for class Vcap.
Defines
#define	EXPMAX   85.00
	Maximum argument for exp(), sinh(), or cosh().
#define	EXPMIN   -85.00
	Minimum argument for exp(), sinh(), or cosh().
Functions
double	Vcap_exp (double x, int *ichop)
	Provide a capped exp() function.
double	Vcap_sinh (double x, int *ichop)
	Provide a capped sinh() function.
double	Vcap_cosh (double x, int *ichop)
	Provide a capped cosh() function.

---

Detailed Description

Collection of routines which cap certain exponential and hyperbolic functions.

Note:

These routines are based on FORTRAN code by Mike Holst

---

Function Documentation

double Vcap_cosh (  double  x, int *  ichop )

Provide a capped cosh() function. If the argument x of Vcap_cosh() exceeds EXPMAX or EXPMIN, then we return cosh(EXPMAX) or cosh(EXPMIN) rather than cosh(x). Note: Original FORTRAN routine from PMG library by Mike Holst Original notes: to control overflow in the hyperbolic and exp functions, note that the following are the argument limits of the various functions on various machines after which overflow occurs: Convex C240, Sun 3/60, Sun SPARC, IBM RS/6000: sinh, cosh, exp: maximal argument (abs value) = 88.0d0 dsinh, dcosh, dexp: maximal argument (abs value) = 709.0d0 Author: Nathan Baker (based on FORTRAN code by Mike Holst) Returns: cosh(x) or capped equivalent Parameters: x  Argument to cosh() ichop  Set to 1 if function capped, 0 otherwise

double Vcap_exp (  double  x, int *  ichop )

Provide a capped exp() function. If the argument x of Vcap_exp() exceeds EXPMAX or EXPMIN, then we return exp(EXPMAX) or exp(EXPMIN) rather than exp(x). Note: Original FORTRAN routine from PMG library by Mike Holst Original notes: to control overflow in the hyperbolic and exp functions, note that the following are the argument limits of the various functions on various machines after which overflow occurs: Convex C240, Sun 3/60, Sun SPARC, IBM RS/6000: sinh, cosh, exp: maximal argument (abs value) = 88.0d0 dsinh, dcosh, dexp: maximal argument (abs value) = 709.0d0 Author: Nathan Baker (based on FORTRAN code by Mike Holst) Returns: exp(x) or capped equivalent Parameters: x  Argument to exp() ichop  Set to 1 if function capped, 0 otherwise

double Vcap_sinh (  double  x, int *  ichop )

Provide a capped sinh() function. If the argument x of Vcap_sinh() exceeds EXPMAX or EXPMIN, then we return sinh(EXPMAX) or sinh(EXPMIN) rather than sinh(x). Note: Original FORTRAN routine from PMG library by Mike Holst Original notes: to control overflow in the hyperbolic and exp functions, note that the following are the argument limits of the various functions on various machines after which overflow occurs: Convex C240, Sun 3/60, Sun SPARC, IBM RS/6000: sinh, cosh, exp: maximal argument (abs value) = 88.0d0 dsinh, dcosh, dexp: maximal argument (abs value) = 709.0d0 Author: Nathan Baker (based on FORTRAN code by Mike Holst) Returns: sinh(x) or capped equivalent Parameters: x  Argument to sinh() ichop  Set to 1 if function capped, 0 otherwise

---