k_exptA – LightKrylov

public interface k_exptA

Utility function to evaluate the matrix-exponential times vector.

    call k_exptA(vec_out, A, vec_in, tau, info, trans)

vec_out : Output vector.

A : Matrix to be exponentiated.

vec_in : Input vector.

tau : Integration time.

info : Information flag.

trans : Whether $A$ or $A^H$ is being used.

Type	Intent	Optional		Name
class(abstract_vector_rsp),	intent(out)		::	vec_out	Solution vector.
class(abstract_linop_rsp),	intent(inout)		::	A	Linear operator to be exponentiated.
class(abstract_vector_rsp),	intent(in)		::	vec_in	Input vector to be multiplied by $\exp(\tau \mathbf{A})$ .
real(kind=sp),	intent(in)		::	tau	Time horizon for the exponentiation.
integer,	intent(out)		::	info	Information flag.
logical,	intent(in),	optional	::	trans	Use adjoint ?

Type	Intent	Optional		Name
class(abstract_vector_rdp),	intent(out)		::	vec_out	Solution vector.
class(abstract_linop_rdp),	intent(inout)		::	A	Linear operator to be exponentiated.
class(abstract_vector_rdp),	intent(in)		::	vec_in	Input vector to be multiplied by $\exp(\tau \mathbf{A})$ .
real(kind=dp),	intent(in)		::	tau	Time horizon for the exponentiation.
integer,	intent(out)		::	info	Information flag.
logical,	intent(in),	optional	::	trans	Use adjoint ?

Type	Intent	Optional		Name
class(abstract_vector_csp),	intent(out)		::	vec_out	Solution vector.
class(abstract_linop_csp),	intent(inout)		::	A	Linear operator to be exponentiated.
class(abstract_vector_csp),	intent(in)		::	vec_in	Input vector to be multiplied by $\exp(\tau \mathbf{A})$ .
real(kind=sp),	intent(in)		::	tau	Time horizon for the exponentiation.
integer,	intent(out)		::	info	Information flag.
logical,	intent(in),	optional	::	trans	Use adjoint ?

Type	Intent	Optional		Name
class(abstract_vector_cdp),	intent(out)		::	vec_out	Solution vector.
class(abstract_linop_cdp),	intent(inout)		::	A	Linear operator to be exponentiated.
class(abstract_vector_cdp),	intent(in)		::	vec_in	Input vector to be multiplied by $\exp(\tau \mathbf{A})$ .
real(kind=dp),	intent(in)		::	tau	Time horizon for the exponentiation.
integer,	intent(out)		::	info	Information flag.
logical,	intent(in),	optional	::	trans	Use adjoint ?