Package netlib.util

Class D1mach

java.lang.Object
netlib.util.D1mach
public class D1mach
extends java.lang.Object
Übertragung der Fortran77-Routine D1MACH aus QUADPACK.

Bestimmt im Original einige maschinenabhängige Konstanten zur Gleitpunktarithmetik für diverse bekannte Architekturen. Hier für die in Java verwendete IEEE-754-Variante angepasst. 


         DOUBLE PRECISION FUNCTION D1MACH(I)
         INTEGER I
   C
   C  DOUBLE-PRECISION MACHINE CONSTANTS
   C  D1MACH( 1) = B**(EMIN-1), THE SMALLEST POSITIVE MAGNITUDE.
   C  D1MACH( 2) = B**EMAX*(1 - B**(-T)), THE LARGEST MAGNITUDE.
   C  D1MACH( 3) = B**(-T), THE SMALLEST RELATIVE SPACING.
   C  D1MACH( 4) = B**(1-T), THE LARGEST RELATIVE SPACING.
   C  D1MACH( 5) = LOG10(B)
   C
Author:
reiser

  • Method Summary

    Modifier and Type Method Description
    static double d1mach​(int i)
    DOUBLE-PRECISION MACHINE CONSTANTS.

    Methods inherited from class java.lang.Object

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

  • Method Details

    • d1mach

      public static double d1mach​(int i)
      DOUBLE-PRECISION MACHINE CONSTANTS.
      Parameters:
      i - 1..5
      Returns:
      Throws:
      java.lang.IllegalArgumentException - iff i not in {1,2,3,4,5}.