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

lapack_int LAPACKE_sstedc (int matrix_order, char compz, lapack_int n, float *d, float *e, float *z, lapack_int ldz)

Function/Subroutine Documentation

lapack_int LAPACKE_sstedc ( int  matrix_order,
char  compz,
lapack_int  n,
float *  d,
float *  e,
float *  z,
lapack_int  ldz 
)

Definition at line 36 of file lapacke_sstedc.c.

{
lapack_int info = 0;
lapack_int liwork = -1;
lapack_int lwork = -1;
lapack_int* iwork = NULL;
float* work = NULL;
lapack_int iwork_query;
float work_query;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_sstedc", -1 );
return -1;
}
#ifndef LAPACK_DISABLE_NAN_CHECK
/* Optionally check input matrices for NaNs */
if( LAPACKE_s_nancheck( n, d, 1 ) ) {
return -4;
}
if( LAPACKE_s_nancheck( n-1, e, 1 ) ) {
return -5;
}
if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
if( LAPACKE_sge_nancheck( matrix_order, n, n, z, ldz ) ) {
return -6;
}
}
#endif
/* Query optimal working array(s) size */
info = LAPACKE_sstedc_work( matrix_order, compz, n, d, e, z, ldz,
&work_query, lwork, &iwork_query, liwork );
if( info != 0 ) {
goto exit_level_0;
}
liwork = (lapack_int)iwork_query;
lwork = (lapack_int)work_query;
/* Allocate memory for work arrays */
iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
if( iwork == NULL ) {
goto exit_level_0;
}
work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
if( work == NULL ) {
goto exit_level_1;
}
/* Call middle-level interface */
info = LAPACKE_sstedc_work( matrix_order, compz, n, d, e, z, ldz, work,
lwork, iwork, liwork );
/* Release memory and exit */
LAPACKE_free( work );
exit_level_1:
LAPACKE_free( iwork );
exit_level_0:
if( info == LAPACK_WORK_MEMORY_ERROR ) {
LAPACKE_xerbla( "LAPACKE_sstedc", info );
}
return info;
}

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