FNEvaluateFunctionMatVec#

Computes the first column of the matrix \(f(A)\) for a given matrix \(A\).

Synopsis#

#include "slepcfn.h" 
PetscErrorCode FNEvaluateFunctionMatVec(FN fn,Mat A,Vec v)

Logically Collective

Input Parameters#

  • fn - the math function context

  • A - matrix on which the function must be evaluated

Output Parameter#

  • v - vector to hold the first column of \(f(A)\)

Notes#

This operation is similar to FNEvaluateFunctionMat() but returns only the first column of \(f(A)\), hence saving computations in most cases.

See Also#

FN: Mathematical Functions, FNEvaluateFunction(), FNEvaluateFunctionMat(), FNSetMethod()

Level#

advanced

Location#

src/sys/classes/fn/interface/fnbasic.c

Implementations#

FNEvaluateFunctionMatVec_Combine() in src/sys/classes/fn/impls/combine/fncombine.c
FNEvaluateFunctionMatVec_Phi() in src/sys/classes/fn/impls/phi/fnphi.c
FNEvaluateFunctionMatVec_Rational() in src/sys/classes/fn/impls/rational/fnrational.c

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