SRC/cupgtr.f(3)            Library Functions Manual            SRC/cupgtr.f(3)

NAME
       SRC/cupgtr.f

SYNOPSIS
   Functions/Subroutines
       subroutine cupgtr (uplo, n, ap, tau, q, ldq, work, info)
           CUPGTR

Function/Subroutine Documentation
   subroutine cupgtr (character uplo, integer n, complex, dimension( * ) ap,
       complex, dimension( * ) tau, complex, dimension( ldq, * ) q, integer
       ldq, complex, dimension( * ) work, integer info)
       CUPGTR

       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).

       Parameters
           UPLO

                     UPLO is CHARACTER*1
                     = 'U': Upper triangular packed storage used in previous
                            call to CHPTRD;
                     = 'L': Lower triangular packed storage used in previous
                            call to CHPTRD.

           N

                     N is INTEGER
                     The order of the matrix Q. N >= 0.

           AP

                     AP is COMPLEX array, dimension (N*(N+1)/2)
                     The vectors which define the elementary reflectors, as
                     returned by CHPTRD.

           TAU

                     TAU is COMPLEX array, dimension (N-1)
                     TAU(i) must contain the scalar factor of the elementary
                     reflector H(i), as returned by CHPTRD.

           Q

                     Q is COMPLEX array, dimension (LDQ,N)
                     The N-by-N unitary matrix Q.

           LDQ

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

           WORK

                     WORK is COMPLEX array, dimension (N-1)

           INFO

                     INFO is INTEGER
                     = 0:  successful exit
                     < 0:  if INFO = -i, the i-th argument had an illegal value

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 113 of file cupgtr.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/cupgtr.f(3)