KSPFCDTruncationType

Define how stored directions are used to orthogonalize in flexible conjugate gradient/directions methods

Synopsis

typedef enum {
  KSP_FCD_TRUNC_TYPE_STANDARD,
  KSP_FCD_TRUNC_TYPE_NOTAY
} KSPFCDTruncationType;

Values

• KSP_FCD_TRUNC_TYPE_STANDARD - uses all (up to mmax) stored directions

• KSP_FCD_TRUNC_TYPE_NOTAY - uses the last max(1,mod(i,mmax)) stored directions at iteration i = 0, 1, …

Note

Function such as KSPFCGSetMmax(), KSPPIPEGCRSetNMax(), KSPPIPEGCRSetNMax(), and KSPPIPEFCGSetNMax() may be used to provide nmax or they may be provided with the option database.

See Also

KSP: Linear System Solvers, KSP, KSPFCG, KSPPIPEFCG, KSPPIPEGCR, KSPFCGSetTruncationType(), KSPFCGGetTruncationType(), KSPPIPEGCRSetTruncationType(), KSPPIPEGCRGetTruncationType(), KSPFCGSetMmax(), KSPPIPEGCRSetNMax(), KSPPIPEGCRGetNMax(), KSPPIPEFCGGetNMax()

Level

intermediate

Location

include/petscksp.h

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Index of all KSP routines
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