LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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sorgl2.f File Reference

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subroutine sorgl2 (M, N, K, A, LDA, TAU, WORK, INFO)

Function/Subroutine Documentation

subroutine sorgl2 ( integer  M,
integer  N,
integer  K,
real, dimension( lda, * )  A,
integer  LDA,
real, dimension( * )  TAU,
real, dimension( * )  WORK,
integer  INFO 


Download SORGL2 + dependencies [TGZ] [ZIP] [TXT]
 SORGL2 generates an m by n real matrix Q with orthonormal rows,
 which is defined as the first m rows of a product of k elementary
 reflectors of order n

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

 as returned by SGELQF.
          M is INTEGER
          The number of rows of the matrix Q. M >= 0.
          N is INTEGER
          The number of columns of the matrix Q. N >= M.
          K is INTEGER
          The number of elementary reflectors whose product defines the
          matrix Q. M >= K >= 0.
          A is REAL array, dimension (LDA,N)
          On entry, the i-th row must contain the vector which defines
          the elementary reflector H(i), for i = 1,2,...,k, as returned
          by SGELQF in the first k rows 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 REAL array, dimension (K)
          TAU(i) must contain the scalar factor of the elementary
          reflector H(i), as returned by SGELQF.
          WORK is REAL array, dimension (M)
          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 114 of file sorgl2.f.

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