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| author | julie <julielangou@users.noreply.github.com> | 2011-11-01 22:02:31 +0000 |
|---|---|---|
| committer | julie <julielangou@users.noreply.github.com> | 2011-11-01 22:02:31 +0000 |
| commit | d5c30c90bdecf38da1064e2ed52583634573e741 (patch) | |
| tree | 480fc5ff31ee14b83116b6428aad79ea6e89362d /SRC/cgges.f | |
| parent | 04670a68760fa27333f8bcef8172f71adc6880ef (diff) | |
Never say never...
Diffstat (limited to 'SRC/cgges.f')
| -rw-r--r-- | SRC/cgges.f | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/SRC/cgges.f b/SRC/cgges.f index 719b52de..723c61fd 100644 --- a/SRC/cgges.f +++ b/SRC/cgges.f @@ -108,8 +108,7 @@ *> to the top left of the Schur form. *> An eigenvalue ALPHA(j)/BETA(j) is selected if *> SELCTG(ALPHA(j),BETA(j)) is true. -*> \endverbatim -*> \verbatim +*> *> Note that a selected complex eigenvalue may no longer satisfy *> SELCTG(ALPHA(j),BETA(j)) = .TRUE. after ordering, since *> ordering may change the value of complex eigenvalues @@ -171,8 +170,7 @@ *> generalized eigenvalues. ALPHA(j), j=1,...,N and BETA(j), *> j=1,...,N are the diagonals of the complex Schur form (A,B) *> output by CGGES. The BETA(j) will be non-negative real. -*> \endverbatim -*> \verbatim +*> *> Note: the quotients ALPHA(j)/BETA(j) may easily over- or *> underflow, and BETA(j) may even be zero. Thus, the user *> should avoid naively computing the ratio alpha/beta. @@ -220,8 +218,7 @@ *> LWORK is INTEGER *> The dimension of the array WORK. LWORK >= max(1,2*N). *> For good performance, LWORK must generally be larger. -*> \endverbatim -*> \verbatim +*> *> If LWORK = -1, then a workspace query is assumed; the routine *> only calculates the optimal size of the WORK array, returns *> this value as the first entry of the WORK array, and no error |