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

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

Function/Subroutine Documentation

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

Definition at line 36 of file lapacke_spteqr.c.

{
lapack_int info = 0;
/* Additional scalars declarations for work arrays */
lapack_int lwork;
float* work = NULL;
if( matrix_order != LAPACK_COL_MAJOR && matrix_order != LAPACK_ROW_MAJOR ) {
LAPACKE_xerbla( "LAPACKE_spteqr", -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, 'v' ) ) {
if( LAPACKE_sge_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 = (float*)LAPACKE_malloc( sizeof(float) * lwork );
if( work == NULL ) {
goto exit_level_0;
}
/* Call middle-level interface */
info = LAPACKE_spteqr_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_spteqr", info );
}
return info;
}

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