du11ls.f
SUBROUTINE DU11LS (A, MDA, M, N, UB, DB, MODE, NP, KRANK, KSURE,
+ H, W, EB, IC, IR)
C***BEGIN PROLOGUE DU11LS
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE Subsidiary to DLLSIA
C***LIBRARY SLATEC
C***TYPE DOUBLE PRECISION (U11LS-S, DU11LS-D)
C***AUTHOR (UNKNOWN)
C***DESCRIPTION
C
C **** Double Precision version of U11LS ****
C
C This routine performs a QR factorization of A
C using Householder transformations. Row and
C column pivots are chosen to reduce the growth
C of round-off and to help detect possible rank
C deficiency.
C
C***SEE ALSO DLLSIA
C***ROUTINES CALLED DAXPY, DDOT, DNRM2, DSCAL, DSWAP, IDAMAX, ISWAP,
C XERMSG
C***REVISION HISTORY (YYMMDD)
C 810801 DATE WRITTEN
C 890531 Changed all specific intrinsics to generic. (WRB)
C 890831 Modified array declarations. (WRB)
C 891009 Removed unreferenced variable. (WRB)
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
C 900328 Added TYPE section. (WRB)
C***END PROLOGUE DU11LS