dsxt13

Usage

Functions/Subroutines

DSXT1

Function/Subroutine Documentation

double precision function dsxt1 (integer ijob, double precision, dimension( * ) d1, integer n1, double precision, dimension( * ) d2, integer n2, double precision abstol, double precision ulp, double precision unfl)

DSXT1

Purpose:

!>
!> DSXT1  computes the difference between a set of eigenvalues.
!> The result is returned as the function value.
!>
!> IJOB = 1:   Computes   max { min | D1(i)-D2(j) | }
!>                         i     j
!>
!> IJOB = 2:   Computes   max { min | D1(i)-D2(j) | /
!>                         i     j
!>                              ( ABSTOL + |D1(i)|*ULP ) }
!>

Parameters

IJOB

!>          IJOB is INTEGER
!>          Specifies the type of tests to be performed.  (See above.)
!>

!>          D1 is DOUBLE PRECISION array, dimension (N1)
!>          The first array.  D1 should be in increasing order, i.e.,
!>          D1(j) <= D1(j+1).
!>

!>          N1 is INTEGER
!>          The length of D1.
!>

!>          D2 is DOUBLE PRECISION array, dimension (N2)
!>          The second array.  D2 should be in increasing order, i.e.,
!>          D2(j) <= D2(j+1).
!>

!>          N2 is INTEGER
!>          The length of D2.
!>

ABSTOL

!>          ABSTOL is DOUBLE PRECISION
!>          The absolute tolerance, used as a measure of the error.
!>

ULP

!>          ULP is DOUBLE PRECISION
!>          Machine precision.
!>

UNFL

!>          UNFL is DOUBLE PRECISION
!>          The smallest positive number whose reciprocal does not
!>          overflow.
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 104 of file dsxt1.f.