119 SUBROUTINE cbdt02( M, N, B, LDB, C, LDC, U, LDU, WORK, RWORK,
128 INTEGER ldb, ldc, ldu, m, n
133 COMPLEX b( ldb, * ), c( ldc, * ), u( ldu, * ),
141 parameter( zero = 0.0e+0, one = 1.0e+0 )
145 REAL bnorm, eps, realmn
155 INTRINSIC cmplx, max, min, real
162 IF( m.LE.0 .OR. n.LE.0 )
164 realmn =
REAL( MAX( M, N ) )
165 eps =
slamch(
'Precision' )
170 CALL
ccopy( m,
b( 1,
j ), 1, work, 1 )
171 CALL
cgemv(
'No transpose', m, m, -cmplx( one ), u, ldu,
172 $ c( 1,
j ), 1, cmplx( one ), work, 1 )
173 resid = max( resid,
scasum( m, work, 1 ) )
178 bnorm =
clange(
'1', m, n,
b, ldb, rwork )
180 IF( bnorm.LE.zero )
THEN
184 IF( bnorm.GE.resid )
THEN
185 resid = ( resid / bnorm ) / ( realmn*eps )
187 IF( bnorm.LT.one )
THEN
188 resid = ( min( resid, realmn*bnorm ) / bnorm ) /
191 resid = min( resid / bnorm, realmn ) / ( realmn*eps )
REAL function slamch(CMACH)
SLAMCH
subroutine cbdt02(M, N, B, LDB, C, LDC, U, LDU, WORK, RWORK, RESID)
CBDT02
set ue cd $ADTTMP cat<< EOF > tmp f Program LinearEquations Implicit none Real b(3) integer i
subroutine cgemv(TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
CGEMV
REAL function clange(NORM, M, N, A, LDA, WORK)
CLANGE returns the value of the 1-norm, Frobenius norm, infinity-norm, or the largest absolute value ...
REAL function scasum(N, CX, INCX)
SCASUM
set ue cd $ADTTMP cat<< EOF > tmp f Program LinearEquations Implicit none Real j
subroutine ccopy(N, CX, INCX, CY, INCY)
CCOPY