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The basic structure of the reverse communication loop for
the nonsymmetric drivers is similar to that for the symmetric
driver with dsaupd replaced with dnaupd. See
The actions taken in dndrv1, dndrv2, dndrv3
and dndrv4 are exactly the same as those in dsdrv1
dsdrv2, dsdrv3 and dsdrv4. The matrix-vector
operations required of each driver are listed in detail below.
The operator OP defined
in dndrv5 and dndrv6 is designed to accomplish
spectral transformations for real nonsymmetric
problems while computing exclusively in real arithmetic, the actions
taken in these two drivers are completely
different from dsdrv5 and dsdrv6.