DGET34
Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
November 2006
November 2006
Purpose
DGET34 tests DLAEXC, a routine for swapping adjacent blocks (either
1 by 1 or 2 by 2) on the diagonal of a matrix in real Schur form.
Thus, DLAEXC computes an orthogonal matrix Q such that
Q' * [ A B ] * Q = [ C1 B1 ]
[ 0 C ] [ 0 A1 ]
where C1 is similar to C and A1 is similar to A. Both A and C are
assumed to be in standard form (equal diagonal entries and
offdiagonal with differing signs) and A1 and C1 are returned with the
same properties.
The test code verifies these last last assertions, as well as that
the residual in the above equation is small.
1 by 1 or 2 by 2) on the diagonal of a matrix in real Schur form.
Thus, DLAEXC computes an orthogonal matrix Q such that
Q' * [ A B ] * Q = [ C1 B1 ]
[ 0 C ] [ 0 A1 ]
where C1 is similar to C and A1 is similar to A. Both A and C are
assumed to be in standard form (equal diagonal entries and
offdiagonal with differing signs) and A1 and C1 are returned with the
same properties.
The test code verifies these last last assertions, as well as that
the residual in the above equation 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 array, dimension (2)
NINFO(J) is the number of examples where INFO=J occurred.
|
| KNT |
(output) INTEGER
Total number of examples tested.
|