
NAMEzupgtr.f SYNOPSISFunctions/Subroutinessubroutine zupgtr (UPLO, N, AP, TAU, Q, LDQ, WORK, INFO) Function/Subroutine Documentationsubroutine zupgtr (characterUPLO, integerN, complex*16, dimension( * )AP, complex*16, dimension( * )TAU, complex*16, dimension( ldq, * )Q, integerLDQ, complex*16, dimension( * )WORK, integerINFO)ZUPGTR Purpose:ZUPGTR generates a complex unitary matrix Q which is defined as the product of n1 elementary reflectors H(i) of order n, as returned by ZHPTRD using packed storage: if UPLO = 'U', Q = H(n1) . . . H(2) H(1), if UPLO = 'L', Q = H(1) H(2) . . . H(n1). UPLO
Author:
UPLO is CHARACTER*1 = 'U': Upper triangular packed storage used in previous call to ZHPTRD; = 'L': Lower triangular packed storage used in previous call to ZHPTRD.N N is INTEGER The order of the matrix Q. N >= 0.AP AP is COMPLEX*16 array, dimension (N*(N+1)/2) The vectors which define the elementary reflectors, as returned by ZHPTRD.TAU TAU is COMPLEX*16 array, dimension (N1) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by ZHPTRD.Q Q is COMPLEX*16 array, dimension (LDQ,N) The NbyN unitary matrix Q.LDQ LDQ is INTEGER The leading dimension of the array Q. LDQ >= max(1,N).WORK WORK is COMPLEX*16 array, dimension (N1)INFO INFO is INTEGER = 0: successful exit < 0: if INFO = i, the ith argument had an illegal value Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Definition at line 115 of file zupgtr.f.
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