LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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ssxt1.f File Reference

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Functions/Subroutines

real function ssxt1 (IJOB, D1, N1, D2, N2, ABSTOL, ULP, UNFL)
 SSXT1 More...
 

Function/Subroutine Documentation

real function ssxt1 ( integer  IJOB,
real, dimension( * )  D1,
integer  N1,
real, dimension( * )  D2,
integer  N2,
real  ABSTOL,
real  ULP,
real  UNFL 
)

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
[in]IJOB
          IJOB is INTEGER
          Specifies the type of tests to be performed.  (See above.)
[in]D1
          D1 is REAL 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 REAL 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 REAL
          The absolute tolerance, used as a measure of the error.
[in]ULP
          ULP is REAL
          Machine precision.
[in]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.
Date
November 2011

Definition at line 106 of file ssxt1.f.

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