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elpa_solve_evp_complex_double(3) FreeBSD Library Functions Manual elpa_solve_evp_complex_double(3)

elpa_solve_evp_complex_double - solve the complex eigenvalue problem with either the 1-satge or the 2-stage ELPA solver (legacy interface)
 

use elpa_driver
 
 
success = elpa_solve_evp_complex_double (na, nev, a(lda,matrixCols), ev(nev), q(ldq, matrixCols), ldq, nblk, matrixCols, mpi_comm_rows, mpi_comm_cols, mpi_comm_all, THIS_COMPLEX_ELPA_KERNEL, useGPU, method)
 
 
With the definitions of the input and output variables:
 
integer, intent(in) na: global dimension of quadratic matrix a to solve
 
integer, intent(in) nev: number of eigenvalues to be computed; the first nev eigenvalules are calculated
 
complex*16, intent(inout) a: locally distributed part of the matrix a. The local dimensions are lda x matrixCols
 
integer, intent(in) lda: leading dimension of locally distributed matrix a
 
real*8, intent(inout) ev: on output the first nev computed eigenvalues
 
complex*16, intent(inout) q: on output the first nev computed eigenvectors
 
integer, intent(in) ldq: leading dimension of matrix q which stores the eigenvectors
 
integer, intent(in) nblk: blocksize of block cyclic distributin, must be the same in both directions
 
integer, intent(in) matrixCols: number of columns of locally distributed matrices a and q
 
integer, intent(in) mpi_comm_rows: communicator for communication in rows. Constructed with elpa_get_communicators(3)
 
integer, intent(in) mpi_comm_cols: communicator for communication in colums. Constructed with elpa_get_communicators(3)
 
integer, intent(in) mpi_comm_all: communicator for all processes in the processor set involved in ELPA
 
int THIS_ELPA_COMPLEX_KERNEL: choose the compute kernel for 2-stage solver
 
logical, optional, intent(in) useGPU: specify whether GPUs should be used or not used
 
character(*), optional method: use 1stage solver if 1stage",use2stagesolverif2stage,(atthemoment)use2stagesolverifauto
logical success: return value indicating success or failure
 

#include "elpa_legacy.h"
 
#include <complex.h>
 
success = elpa_solve_evp_complex_double (int na, int nev, double complex *a, int lda, double *ev, double complex *q, int ldq, int nblk, int matrixCols, int mpi_comm_rows, int mpi_comm_cols, int mpi_comm_all, int THIS_ELPA_COMPLEX_KERNEL, int useGPU, char *method);
 
 
With the definitions of the input and output variables:
 
int na: global dimension of quadratic matrix a to solve
 
int nev: number of eigenvalues to be computed; the first nev eigenvalules are calculated
 
double complex * a: pointer to locally distributed part of the matrix a. The local dimensions are lda x matrixCols
 
int lda: leading dimension of locally distributed matrix a
 
double * ev: pointer to memory containing on output the first nev computed eigenvalues
 
double complex * q: pointer to memory containing on output the first nev computed eigenvectors
 
int ldq: leading dimension of matrix q which stores the eigenvectors
 
int nblk: blocksize of block cyclic distributin, must be the same in both directions
 
int matrixCols: number of columns of locally distributed matrices a and q
 
int mpi_comm_rows: communicator for communication in rows. Constructed with elpa_get_communicators(3)
 
int mpi_comm_cols: communicator for communication in colums. Constructed with elpa_get_communicators(3)
 
int mpi_comm_all: communicator for all processes in the processor set involved in ELPA
 
int THIS_ELPA_COMPLEX_KERNEL: choose the compute kernel for 2-stage solver
 
int useGPU: specify whether GPUS should be used or not
 
char * method: use 1stage solver if 1stage",use2stagesolverif2stage,(atthemoment)use2stagesolverifauto
int success: return value indicating success (1) or failure (0)

Solve the complex eigenvalue problem. The value of method desides whether the 1stage or 2stage solver is used. The ELPA communicators mpi_comm_rows and mpi_comm_cols are obtained with the elpa_get_communicators(3) function. The distributed quadratic marix a has global dimensions na x na, and a local size lda x matrixCols. The solver will compute the first nev eigenvalues, which will be stored on exit in ev. The eigenvectors corresponding to the eigenvalues will be stored in q. All memory of the arguments must be allocated outside the call to the solver.
 
This function is part of the legacy API of the ELPA library. Better use the current API.
 

Old interface: elpa_get_communicators(3) elpa_solve_evp_real_double(3) elpa_solve_evp_real_single(3) elpa_solve_evp_complex_single(3)
 
Current interface: elpa2_print_kernels(1)
Wed May 17 2017 ELPA

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