diff options
Diffstat (limited to 'SRC/dlasq1.f')
| -rw-r--r-- | SRC/dlasq1.f | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/SRC/dlasq1.f b/SRC/dlasq1.f index 53fd3ddd..9ecb07b6 100644 --- a/SRC/dlasq1.f +++ b/SRC/dlasq1.f @@ -56,8 +56,11 @@ * < 0: if INFO = -i, the i-th argument had an illegal value * > 0: the algorithm failed * = 1, a split was marked by a positive value in E -* = 2, current block of Z not diagonalized after 30*N -* iterations (in inner while loop) +* = 2, current block of Z not diagonalized after 100*N +* iterations (in inner while loop) On exit D and E +* represent a matrix with the same singular values +* which the calling subroutine could use to finish the +* computation, or even feed back into DLASQ1 * = 3, termination criterion of outer while loop not met * (program created more than N unreduced blocks) * @@ -145,6 +148,17 @@ D( I ) = SQRT( WORK( I ) ) 40 CONTINUE CALL DLASCL( 'G', 0, 0, SCALE, SIGMX, N, 1, D, N, IINFO ) + ELSE IF( INFO.EQ.2 ) THEN +* +* Maximum number of iterations exceeded. Move data from WORK +* into D and E so the calling subroutine can try to finish +* + DO I = 1, N + D( I ) = SQRT( WORK( 2*I-1 ) ) + E( I ) = SQRT( WORK( 2*I ) ) + END DO + CALL DLASCL( 'G', 0, 0, SCALE, SIGMX, N, 1, D, N, IINFO ) + CALL DLASCL( 'G', 0, 0, SCALE, SIGMX, N, 1, E, N, IINFO ) END IF * RETURN |