LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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cung2r.f File Reference

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subroutine cung2r (M, N, K, A, LDA, TAU, WORK, INFO)

Function/Subroutine Documentation

subroutine cung2r ( integer  M,
integer  N,
integer  K,
complex, dimension( lda, * )  A,
integer  LDA,
complex, dimension( * )  TAU,
complex, dimension( * )  WORK,
integer  INFO 


Download CUNG2R + dependencies [TGZ] [ZIP] [TXT]
 CUNG2R generates an m by n complex matrix Q with orthonormal columns,
 which is defined as the first n columns of a product of k elementary
 reflectors of order m

       Q  =  H(1) H(2) . . . H(k)

 as returned by CGEQRF.
          M is INTEGER
          The number of rows of the matrix Q. M >= 0.
          N is INTEGER
          The number of columns of the matrix Q. M >= N >= 0.
          K is INTEGER
          The number of elementary reflectors whose product defines the
          matrix Q. N >= K >= 0.
          A is COMPLEX array, dimension (LDA,N)
          On entry, the i-th column must contain the vector which
          defines the elementary reflector H(i), for i = 1,2,...,k, as
          returned by CGEQRF in the first k columns of its array
          argument A.
          On exit, the m by n matrix Q.
          LDA is INTEGER
          The first dimension of the array A. LDA >= max(1,M).
          TAU is COMPLEX array, dimension (K)
          TAU(i) must contain the scalar factor of the elementary
          reflector H(i), as returned by CGEQRF.
          WORK is COMPLEX array, dimension (N)
          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -i, the i-th argument has an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
November 2011

Definition at line 115 of file cung2r.f.

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