slepc-3.19.2 2023-09-05
   
DSNEPSetComputeMatrixFunction
Sets a user-provided subroutine to compute the matrices T(lambda) or T'(lambda). 
Synopsis
#include "slepcds.h" 
PetscErrorCode DSNEPSetComputeMatrixFunction(DS ds,PetscErrorCode (*fun)(DS ds,PetscScalar lambda,PetscBool deriv,DSMatType mat,void *ctx),void *ctx)
Logically Collective
Input Parameters
|  | ds | - the direct solver context | 
|  | fun | - a pointer to the user function | 
|  | ctx | - a context pointer (the last parameter to the user function) | 
Calling sequence of fun
 PetscErrorCode fun(DS ds,PetscScalar lambda,PetscBool deriv,DSMatType mat,void *ctx)
|  | ds | - the direct solver object | 
|  | lambda | - point where T(lambda) or T'(lambda) must be evaluated | 
|  | deriv | - if true compute T'(lambda), otherwise compute T(lambda) | 
|  | mat | - the DS matrix where the result must be stored | 
|  | ctx | - optional context, as set by DSNEPSetComputeMatrixFunction() | 
Note
The result is computed as T(lambda) = sum_i E_i*f_i(lambda), and similarly
for the derivative.
See Also
 DSNEPGetComputeMatrixFunction()
Level
developer
Location
src/sys/classes/ds/impls/nep/dsnep.c
Index of all DS routines
Table of Contents for all manual pages
Index of all manual pages