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General Shift-Invert Spectral Transformation


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