ssxt1.f - Man Page

real function ssxt1 (ijob, d1, n1, d2, n2, abstol, ulp, unfl)
SSXT1

SSXT1

Purpose:

 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 ) }

Parameters

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.

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 104 of file ssxt1.f.