org.netlib.lapack
Class Dlamch

java.lang.Object
  org.netlib.lapack.Dlamch

public class Dlamch
extends java.lang.Object

Following is the description from the original
Fortran source.  For each array argument, the Java
version will include an integer offset parameter, so
the arguments may not match the description exactly.
Contact seymour@cs.utk.edu with any questions.


 *     ..
 *
 *  Purpose
 *  =======
 *
 *  DLAMCH determines double precision machine parameters.
 *
 *  Arguments
 *  =========
 *
 *  CMACH   (input) CHARACTER*1
 *          Specifies the value to be returned by DLAMCH:
 *          = 'E' or 'e',   DLAMCH := eps
 *          = 'S' or 's ,   DLAMCH := sfmin
 *          = 'B' or 'b',   DLAMCH := base
 *          = 'P' or 'p',   DLAMCH := eps*base
 *          = 'N' or 'n',   DLAMCH := t
 *          = 'R' or 'r',   DLAMCH := rnd
 *          = 'M' or 'm',   DLAMCH := emin
 *          = 'U' or 'u',   DLAMCH := rmin
 *          = 'L' or 'l',   DLAMCH := emax
 *          = 'O' or 'o',   DLAMCH := rmax
 *
 *          where
 *
 *          eps   = relative machine precision
 *          sfmin = safe minimum, such that 1/sfmin does not overflow
 *          base  = base of the machine
 *          prec  = eps*base
 *          t     = number of (base) digits in the mantissa
 *          rnd   = 1.0 when rounding occurs in addition, 0.0 otherwise
 *          emin  = minimum exponent before (gradual) underflow
 *          rmin  = underflow threshold - base**(emin-1)
 *          emax  = largest exponent before overflow
 *          rmax  = overflow threshold  - (base**emax)*(1-eps)
 *
 * =====================================================================

 *
 *     .. Parameters ..

Field Summary

static double	base
static double	emax
static double	emin
static doubleW	eps
static boolean	first
static double	prec
static doubleW	rmax
static doubleW	rmin
static double	rnd
static double	sfmin
static double	t

Constructor Summary

Dlamch()

Method Summary

static double

dlamch(java.lang.String cmach)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

base

public static double base

emax

public static double emax

emin

public static double emin

eps

public static doubleW eps

prec

public static double prec

rmax

public static doubleW rmax

rmin

public static doubleW rmin

rnd

public static double rnd

sfmin

public static double sfmin

t

public static double t

first

public static boolean first

Constructor Detail

Dlamch

public Dlamch()

Method Detail

dlamch

public static double dlamch(java.lang.String cmach)