diff options
Diffstat (limited to 'SRC/dstebz.f')
| -rw-r--r-- | SRC/dstebz.f | 18 |
1 files changed, 6 insertions, 12 deletions
diff --git a/SRC/dstebz.f b/SRC/dstebz.f index 095ea368..a8933108 100644 --- a/SRC/dstebz.f +++ b/SRC/dstebz.f @@ -93,8 +93,7 @@ *> \param[in] VU *> \verbatim *> VU is DOUBLE PRECISION -*> \endverbatim -*> \verbatim +*> *> If RANGE='V', the lower and upper bounds of the interval to *> be searched for eigenvalues. Eigenvalues less than or equal *> to VL, or greater than VU, will not be returned. VL < VU. @@ -109,8 +108,7 @@ *> \param[in] IU *> \verbatim *> IU is INTEGER -*> \endverbatim -*> \verbatim +*> *> If RANGE='I', the indices (in ascending order) of the *> smallest and largest eigenvalues to be returned. *> 1 <= IL <= IU <= N, if N > 0; IL = 1 and IU = 0 if N = 0. @@ -125,8 +123,7 @@ *> determined to lie in an interval whose width is ABSTOL or *> less. If ABSTOL is less than or equal to zero, then ULP*|T| *> will be used, where |T| means the 1-norm of T. -*> \endverbatim -*> \verbatim +*> *> Eigenvalues will be computed most accurately when ABSTOL is *> set to twice the underflow threshold 2*DLAMCH('S'), not zero. *> \endverbatim @@ -229,19 +226,16 @@ *> floating-point arithmetic. *> Cure: Increase the PARAMETER "FUDGE", *> recompile, and try again. -*> \endverbatim -*> \verbatim +*> *> Internal Parameters *> =================== -*> \endverbatim -*> \verbatim +*> *> RELFAC DOUBLE PRECISION, default = 2.0e0 *> The relative tolerance. An interval (a,b] lies within *> "relative tolerance" if b-a < RELFAC*ulp*max(|a|,|b|), *> where "ulp" is the machine precision (distance from 1 to *> the next larger floating point number.) -*> \endverbatim -*> \verbatim +*> *> FUDGE DOUBLE PRECISION, default = 2 *> A "fudge factor" to widen the Gershgorin intervals. Ideally, *> a value of 1 should work, but on machines with sloppy |