LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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lapacke_zpteqr.c File Reference
#include "lapacke_utils.h"
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Functions/Subroutines

lapack_int LAPACKE_zpteqr (int matrix_order, char compz, lapack_int n, double *d, double *e, lapack_complex_double *z, lapack_int ldz)

Function/Subroutine Documentation

lapack_int LAPACKE_zpteqr ( int  matrix_order,
char  compz,
lapack_int  n,
double *  d,
double *  e,
lapack_complex_double z,
lapack_int  ldz 
)

Definition at line 36 of file lapacke_zpteqr.c.

{
lapack_int info = 0;
/* Additional scalars declarations for work arrays */
lapack_int lwork;
double* work = NULL;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_zpteqr", -1 );
return -1;
}
#ifndef LAPACK_DISABLE_NAN_CHECK
/* Optionally check input matrices for NaNs */
if( LAPACKE_d_nancheck( n, d, 1 ) ) {
return -4;
}
if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
return -5;
}
if( LAPACKE_lsame( compz, 'v' ) ) {
if( LAPACKE_zge_nancheck( matrix_order, n, n, z, ldz ) ) {
return -6;
}
}
#endif
/* Additional scalars initializations for work arrays */
if( LAPACKE_lsame( compz, 'n' ) ) {
lwork = 1;
} else {
lwork = MAX(1,4*n-4);
}
/* Allocate memory for working array(s) */
work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
if( work == NULL ) {
goto exit_level_0;
}
/* Call middle-level interface */
info = LAPACKE_zpteqr_work( matrix_order, compz, n, d, e, z, ldz, work );
/* Release memory and exit */
LAPACKE_free( work );
exit_level_0:
if( info == LAPACK_WORK_MEMORY_ERROR ) {
LAPACKE_xerbla( "LAPACKE_zpteqr", info );
}
return info;
}

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