cupgtr (3p)

Name

cupgtr - generate a complex unitary matrix Q which is defined as the product of n-1 elementary reflectors H(i) of order n, as returned by CHPTRD using packed storage

Synopsis

SUBROUTINE CUPGTR(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

CHARACTER*1 UPLO
COMPLEX AP(*), TAU(*), Q(LDQ,*), WORK(*)
INTEGER N, LDQ, INFO

SUBROUTINE CUPGTR_64(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

CHARACTER*1 UPLO
COMPLEX AP(*), TAU(*), Q(LDQ,*), WORK(*)
INTEGER*8 N, LDQ, INFO




F95 INTERFACE
SUBROUTINE UPGTR(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
COMPLEX, DIMENSION(:) :: AP, TAU, WORK
COMPLEX, DIMENSION(:,:) :: Q
INTEGER :: N, LDQ, INFO

SUBROUTINE UPGTR_64(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
COMPLEX, DIMENSION(:) :: AP, TAU, WORK
COMPLEX, DIMENSION(:,:) :: Q
INTEGER(8) :: N, LDQ, INFO




C INTERFACE
#include <sunperf.h>

void  cupgtr(char  uplo,  int n, complex *ap, complex *tau, complex *q,
int ldq, int *info);

void cupgtr_64(char uplo, long n, complex *ap,  complex  *tau,  complex
*q, long ldq, long *info);

Description

Oracle Solaris Studio Performance Library                           cupgtr(3P)



NAME
       cupgtr  -  generate  a complex unitary matrix Q which is defined as the
       product of n-1 elementary reflectors H(i) of order n,  as  returned  by
       CHPTRD using packed storage


SYNOPSIS
       SUBROUTINE CUPGTR(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

       CHARACTER*1 UPLO
       COMPLEX AP(*), TAU(*), Q(LDQ,*), WORK(*)
       INTEGER N, LDQ, INFO

       SUBROUTINE CUPGTR_64(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

       CHARACTER*1 UPLO
       COMPLEX AP(*), TAU(*), Q(LDQ,*), WORK(*)
       INTEGER*8 N, LDQ, INFO




   F95 INTERFACE
       SUBROUTINE UPGTR(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       COMPLEX, DIMENSION(:) :: AP, TAU, WORK
       COMPLEX, DIMENSION(:,:) :: Q
       INTEGER :: N, LDQ, INFO

       SUBROUTINE UPGTR_64(UPLO, N, AP, TAU, Q, LDQ, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       COMPLEX, DIMENSION(:) :: AP, TAU, WORK
       COMPLEX, DIMENSION(:,:) :: Q
       INTEGER(8) :: N, LDQ, INFO




   C INTERFACE
       #include <sunperf.h>

       void  cupgtr(char  uplo,  int n, complex *ap, complex *tau, complex *q,
                 int ldq, int *info);

       void cupgtr_64(char uplo, long n, complex *ap,  complex  *tau,  complex
                 *q, long ldq, long *info);



PURPOSE
       cupgtr  generates  a  complex  unitary matrix Q which is defined as the
       product of n-1 elementary reflectors H(i) of order n,  as  returned  by
       CHPTRD using packed storage:

       if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),

       if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).


ARGUMENTS
       UPLO (input)
                 =  'U': Upper triangular packed storage used in previous call
                 to CHPTRD; = 'L': Lower triangular  packed  storage  used  in
                 previous call to CHPTRD.


       N (input) The order of the matrix Q. N >= 0.


       AP (input)
                 The  vectors  which  define  the  elementary  reflectors,  as
                 returned by CHPTRD.


       TAU (input)
                 TAU(i) must contain  the  scalar  factor  of  the  elementary
                 reflector H(i), as returned by CHPTRD.


       Q (output)
                 The N-by-N unitary matrix Q.


       LDQ (input)
                 The leading dimension of the array Q. LDQ >= max(1,N).


       WORK (workspace)
                 dimension(N-1)

       INFO (output)
                 = 0:  successful exit
                 < 0:  if INFO = -i, the i-th argument had an illegal value




                                  7 Nov 2015                        cupgtr(3P)