diff options
Diffstat (limited to 'SRC/ssyevr.f')
| -rw-r--r-- | SRC/ssyevr.f | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/SRC/ssyevr.f b/SRC/ssyevr.f index 8bd78f17..1ee75462 100644 --- a/SRC/ssyevr.f +++ b/SRC/ssyevr.f @@ -185,22 +185,18 @@ *> An approximate eigenvalue is accepted as converged *> when it is determined to lie in an interval [a,b] *> of width less than or equal to -*> \endverbatim -*> \verbatim +*> *> ABSTOL + EPS * max( |a|,|b| ) , -*> \endverbatim -*> \verbatim +*> *> where EPS is the machine precision. If ABSTOL is less than *> or equal to zero, then EPS*|T| will be used in its place, *> where |T| is the 1-norm of the tridiagonal matrix obtained *> by reducing A to tridiagonal form. -*> \endverbatim -*> \verbatim +*> *> See "Computing Small Singular Values of Bidiagonal Matrices *> with Guaranteed High Relative Accuracy," by Demmel and *> Kahan, LAPACK Working Note #3. -*> \endverbatim -*> \verbatim +*> *> If high relative accuracy is important, set ABSTOL to *> SLAMCH( 'Safe minimum' ). Doing so will guarantee that *> eigenvalues are computed to high relative accuracy when @@ -271,8 +267,7 @@ *> For optimal efficiency, LWORK >= (NB+6)*N, *> where NB is the max of the blocksize for SSYTRD and SORMTR *> returned by ILAENV. -*> \endverbatim -*> \verbatim +*> *> If LWORK = -1, then a workspace query is assumed; the routine *> only calculates the optimal sizes of the WORK and IWORK *> arrays, returns these values as the first entries of the WORK @@ -290,8 +285,7 @@ *> \verbatim *> LIWORK is INTEGER *> The dimension of the array IWORK. LIWORK >= max(1,10*N). -*> \endverbatim -*> \verbatim +*> *> If LIWORK = -1, then a workspace query is assumed; the *> routine only calculates the optimal sizes of the WORK and *> IWORK arrays, returns these values as the first entries of |