LAPACK  3.7.0
LAPACK: Linear Algebra PACKage
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
[in]IJOB
          IJOB is INTEGER
          Specifies the type of tests to be performed.  (See above.)
[in]D1
          D1 is DOUBLE PRECISION array, dimension (N1)
          The first array.  D1 should be in increasing order, i.e.,
          D1(j) <= D1(j+1).
[in]N1
          N1 is INTEGER
          The length of D1.
[in]D2
          D2 is DOUBLE PRECISION array, dimension (N2)
          The second array.  D2 should be in increasing order, i.e.,
          D2(j) <= D2(j+1).
[in]N2
          N2 is INTEGER
          The length of D2.
[in]ABSTOL
          ABSTOL is DOUBLE PRECISION
          The absolute tolerance, used as a measure of the error.
[in]ULP
          ULP is DOUBLE PRECISION
          Machine precision.
[in]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.
Date
December 2016