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If eigenvalues near a point are sought, then the
shift-invert driver `zndrv4` should be used.
To use this driver, one is required to supply the action of

The IRAM will find selected
eigenvalues of depending on the
setting of `which`. The recommended setting for computing
eigenvalues of the pair () nearest to is `which = 'LM'`. However, other settings are not
precluded.

*Chao Yang*

*11/7/1997*