98 REAL FUNCTION crzt01( M, N, A, AF, LDA, TAU, WORK,
107 INTEGER LDA, LWORK, M, N
110 COMPLEX A( lda, * ), AF( lda, * ), TAU( * ),
118 parameter( zero = 0.0e0, one = 1.0e0 )
129 EXTERNAL clange, slamch
135 INTRINSIC cmplx, max, real
141 IF( lwork.LT.m*n+m )
THEN
142 CALL
xerbla(
'CRZT01', 8 )
148 IF( m.LE.0 .OR. n.LE.0 )
151 norma = clange(
'One-norm', m, n, a, lda, rwork )
155 CALL
claset(
'Full', m, n, cmplx( zero ), cmplx( zero ), work, m )
158 work( ( j-1 )*m+i ) = af( i, j )
164 CALL
cunmrz(
'Right',
'No tranpose', m, n, m, n-m, af, lda, tau,
165 $ work, m, work( m*n+1 ), lwork-m*n, info )
170 CALL
caxpy( m, cmplx( -one ), a( 1, i ), 1,
171 $ work( ( i-1 )*m+1 ), 1 )
174 crzt01 = clange(
'One-norm', m, n, work, m, rwork )
176 crzt01 = crzt01 / ( slamch(
'Epsilon' )*
REAL( MAX( M, N ) ) )
178 $ crzt01 = crzt01 / norma
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 caxpy(N, CA, CX, INCX, CY, INCY)
CAXPY
subroutine xerbla(SRNAME, INFO)
XERBLA
subroutine cunmrz(SIDE, TRANS, M, N, K, L, A, LDA, TAU, C, LDC, WORK, LWORK, INFO)
CUNMRZ