CQLT03 tests CUNMQL, which computes Q*C, Q'*C, C*Q or C*Q'.


 CQLT03 compares the results of a call to CUNMQL with the results of


 forming Q explicitly by a call to CUNGQL and then performing matrix


 multiplication by a call to CGEMM.

M

          M is INTEGER


          The order of the orthogonal matrix Q.  M >= 0.

N

          N is INTEGER


          The number of rows or columns of the matrix C; C is m-by-n if


          Q is applied from the left, or n-by-m if Q is applied from


          the right.  N >= 0.

K

          K is INTEGER


          The number of elementary reflectors whose product defines the


          orthogonal matrix Q.  M >= K >= 0.

AF

          AF is COMPLEX array, dimension (LDA,N)


          Details of the QL factorization of an m-by-n matrix, as


          returned by CGEQLF. See CGEQLF for further details.

C

          C is COMPLEX array, dimension (LDA,N)

CC

          CC is COMPLEX array, dimension (LDA,N)

Q

          Q is COMPLEX array, dimension (LDA,M)

LDA

          LDA is INTEGER


          The leading dimension of the arrays AF, C, CC, and Q.

TAU

          TAU is COMPLEX array, dimension (min(M,N))


          The scalar factors of the elementary reflectors corresponding


          to the QL factorization in AF.

WORK

          WORK is COMPLEX array, dimension (LWORK)

LWORK

          LWORK is INTEGER


          The length of WORK.  LWORK must be at least M, and should be


          M*NB, where NB is the blocksize for this environment.

RWORK

          RWORK is REAL array, dimension (M)

RESULT

          RESULT is REAL array, dimension (4)


          The test ratios compare two techniques for multiplying a


          random matrix C by an m-by-m orthogonal matrix Q.


          RESULT(1) = norm( Q*C - Q*C )  / ( M * norm(C) * EPS )


          RESULT(2) = norm( C*Q - C*Q )  / ( M * norm(C) * EPS )


          RESULT(3) = norm( Q'*C - Q'*C )/ ( M * norm(C) * EPS )


          RESULT(4) = norm( C*Q' - C*Q' )/ ( M * norm(C) * EPS )

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.