91 REAL FUNCTION ctzt02( M, N, AF, LDA, TAU, WORK,
100 INTEGER LDA, LWORK, M, N
103 COMPLEX AF( lda, * ), TAU( * ), WORK( lwork )
110 parameter( zero = 0.0e0, one = 1.0e0 )
120 EXTERNAL clange, slamch
126 INTRINSIC cmplx, conjg, max, real
132 IF( lwork.LT.n*n+n )
THEN
133 CALL
xerbla(
'CTZT02', 7 )
139 IF( m.LE.0 .OR. n.LE.0 )
144 CALL
claset(
'Full', n, n, cmplx( zero ), cmplx( one ), work, n )
149 CALL
clatzm(
'Left', n-m+1, n, af( i, m+1 ), lda, tau( i ),
150 $ work( i ), work( m+1 ), n, work( n*n+1 ) )
156 CALL
clatzm(
'Left', n-m+1, n, af( i, m+1 ), lda,
157 $ conjg( tau( i ) ), work( i ), work( m+1 ), n,
164 work( ( i-1 )*n+i ) = work( ( i-1 )*n+i ) - one
167 ctzt02 = clange(
'One-norm', n, n, work, n, rwork ) /
168 $ ( slamch(
'Epsilon' )*
REAL( MAX( M, N ) ) )
subroutine claset(UPLO, M, N, ALPHA, BETA, A, LDA)
CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values...
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine clatzm(SIDE, M, N, V, INCV, TAU, C1, C2, LDC, WORK)
CLATZM