DGET33
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DGET33 tests DLANV2, a routine for putting 2 by 2 blocks into
standard form. In other words, it computes a two by two rotation
[[C,S];[-S,C]] where in
[ C S ][T(1,1) T(1,2)][ C -S ] = [ T11 T12 ]
[-S C ][T(2,1) T(2,2)][ S C ] [ T21 T22 ]
either
1) T21=0 (real eigenvalues), or
2) T11=T22 and T21*T12<0 (complex conjugate eigenvalues).
We also verify that the residual is small.
standard form. In other words, it computes a two by two rotation
[[C,S];[-S,C]] where in
[ C S ][T(1,1) T(1,2)][ C -S ] = [ T11 T12 ]
[-S C ][T(2,1) T(2,2)][ S C ] [ T21 T22 ]
either
1) T21=0 (real eigenvalues), or
2) T11=T22 and T21*T12<0 (complex conjugate eigenvalues).
We also verify that the residual is small.
Arguments
| RMAX |
(output) DOUBLE PRECISION
Value of the largest test ratio.
|
| LMAX |
(output) INTEGER
Example number where largest test ratio achieved.
|
| NINFO |
(output) INTEGER
Number of examples returned with INFO .NE. 0.
|
| KNT |
(output) INTEGER
Total number of examples tested.
|