NAME

TESTING/EIG/dsxt1.f

SYNOPSIS

Functions/Subroutines

double precision function dsxt1 (ijob, d1, n1, d2, n2, abstol, ulp, unfl)
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.

Author

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