SSXT1  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 ) }

IJOB

          IJOB is INTEGER


          Specifies the type of tests to be performed.  (See above.)

D1

          D1 is REAL array, dimension (N1)


          The first array.  D1 should be in increasing order, i.e.,


          D1(j) <= D1(j+1).

N1

          N1 is INTEGER


          The length of D1.

D2

          D2 is REAL array, dimension (N2)


          The second array.  D2 should be in increasing order, i.e.,


          D2(j) <= D2(j+1).

N2

          N2 is INTEGER


          The length of D2.

ABSTOL

          ABSTOL is REAL


          The absolute tolerance, used as a measure of the error.

ULP

          ULP is REAL


          Machine precision.

UNFL

          UNFL is REAL


          The smallest positive number whose reciprocal does not


          overflow.

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