EPSWhich

Determines which part of the spectrum is requested.

Synopsis

typedef enum { EPS_LARGEST_MAGNITUDE  = 1,
               EPS_SMALLEST_MAGNITUDE = 2,
               EPS_LARGEST_REAL       = 3,
               EPS_SMALLEST_REAL      = 4,
               EPS_LARGEST_IMAGINARY  = 5,
               EPS_SMALLEST_IMAGINARY = 6,
               EPS_TARGET_MAGNITUDE   = 7,
               EPS_TARGET_REAL        = 8,
               EPS_TARGET_IMAGINARY   = 9,
               EPS_ALL                = 10,
               EPS_WHICH_USER         = 11 } EPSWhich;

Values

• EPS_LARGEST_MAGNITUDE - largest \(|\lambda|\)

• EPS_SMALLEST_MAGNITUDE - smallest \(|\lambda|\)

• EPS_LARGEST_REAL - largest \(\mathrm{Re}(\lambda)\)

• EPS_SMALLEST_REAL - smallest \(\mathrm{Re}(\lambda)\)

• EPS_LARGEST_IMAGINARY - largest \(\mathrm{Im}(\lambda)\)

• EPS_SMALLEST_IMAGINARY - smallest \(\mathrm{Im}(\lambda)\)

• EPS_TARGET_MAGNITUDE - smallest \(|\lambda-\tau|\)

• EPS_TARGET_REAL - smallest \(|\mathrm{Re}(\lambda-\tau)|\)

• EPS_TARGET_IMAGINARY - smallest \(|\mathrm{Im}(\lambda-\tau)|\)

• EPS_ALL - all \(\lambda\in[a,b]\) or \(\lambda\in\Omega\)

• EPS_WHICH_USER - user-defined sorting criterion

Notes

If SLEPc is compiled for real scalars EPS_LARGEST_IMAGINARY and EPS_SMALLEST_IMAGINARY use the absolute value of the imaginary part for eigenvalue selection.

The target \(\tau\) is a scalar value provided with EPSSetTarget().

The case EPS_ALL needs an interval \([a,b]\) given with EPSSetInterval() or a region \(\Omega\) specified with an RG object.

See Also

EPS: Eigenvalue Problem Solver, EPSSetWhichEigenpairs(), EPSSetTarget(), EPSSetInterval()

Level

intermediate

Location

include/slepceps.h

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