LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
 All Files Functions Typedefs Macros
cgqrts.f File Reference

Go to the source code of this file.

Functions/Subroutines

subroutine cgqrts (N, M, P, A, AF, Q, R, LDA, TAUA, B, BF, Z, T, BWK, LDB, TAUB, WORK, LWORK, RWORK, RESULT)
 CGQRTS More...
 

Function/Subroutine Documentation

subroutine cgqrts ( integer  N,
integer  M,
integer  P,
complex, dimension( lda, * )  A,
complex, dimension( lda, * )  AF,
complex, dimension( lda, * )  Q,
complex, dimension( lda, * )  R,
integer  LDA,
complex, dimension( * )  TAUA,
complex, dimension( ldb, * )  B,
complex, dimension( ldb, * )  BF,
complex, dimension( ldb, * )  Z,
complex, dimension( ldb, * )  T,
complex, dimension( ldb, * )  BWK,
integer  LDB,
complex, dimension( * )  TAUB,
complex, dimension( lwork )  WORK,
integer  LWORK,
real, dimension( * )  RWORK,
real, dimension( 4 )  RESULT 
)

CGQRTS

Purpose:
 CGQRTS tests CGGQRF, which computes the GQR factorization of an
 N-by-M matrix A and a N-by-P matrix B: A = Q*R and B = Q*T*Z.
Parameters
[in]N
          N is INTEGER
          The number of rows of the matrices A and B.  N >= 0.
[in]M
          M is INTEGER
          The number of columns of the matrix A.  M >= 0.
[in]P
          P is INTEGER
          The number of columns of the matrix B.  P >= 0.
[in]A
          A is COMPLEX array, dimension (LDA,M)
          The N-by-M matrix A.
[out]AF
          AF is COMPLEX array, dimension (LDA,N)
          Details of the GQR factorization of A and B, as returned
          by CGGQRF, see CGGQRF for further details.
[out]Q
          Q is COMPLEX array, dimension (LDA,N)
          The M-by-M unitary matrix Q.
[out]R
          R is COMPLEX array, dimension (LDA,MAX(M,N))
[in]LDA
          LDA is INTEGER
          The leading dimension of the arrays A, AF, R and Q.
          LDA >= max(M,N).
[out]TAUA
          TAUA is COMPLEX array, dimension (min(M,N))
          The scalar factors of the elementary reflectors, as returned
          by CGGQRF.
[in]B
          B is COMPLEX array, dimension (LDB,P)
          On entry, the N-by-P matrix A.
[out]BF
          BF is COMPLEX array, dimension (LDB,N)
          Details of the GQR factorization of A and B, as returned
          by CGGQRF, see CGGQRF for further details.
[out]Z
          Z is COMPLEX array, dimension (LDB,P)
          The P-by-P unitary matrix Z.
[out]T
          T is COMPLEX array, dimension (LDB,max(P,N))
[out]BWK
          BWK is COMPLEX array, dimension (LDB,N)
[in]LDB
          LDB is INTEGER
          The leading dimension of the arrays B, BF, Z and T.
          LDB >= max(P,N).
[out]TAUB
          TAUB is COMPLEX array, dimension (min(P,N))
          The scalar factors of the elementary reflectors, as returned
          by SGGRQF.
[out]WORK
          WORK is COMPLEX array, dimension (LWORK)
[in]LWORK
          LWORK is INTEGER
          The dimension of the array WORK, LWORK >= max(N,M,P)**2.
[out]RWORK
          RWORK is REAL array, dimension (max(N,M,P))
[out]RESULT
          RESULT is REAL array, dimension (4)
          The test ratios:
            RESULT(1) = norm( R - Q'*A ) / ( MAX(M,N)*norm(A)*ULP)
            RESULT(2) = norm( T*Z - Q'*B ) / (MAX(P,N)*norm(B)*ULP)
            RESULT(3) = norm( I - Q'*Q ) / ( M*ULP )
            RESULT(4) = norm( I - Z'*Z ) / ( P*ULP )
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date
November 2011

Definition at line 176 of file cgqrts.f.

Here is the call graph for this function:

Here is the caller graph for this function: