SLATEC Routines --- U11LS ---

*DECK U11LS
      SUBROUTINE U11LS (A, MDA, M, N, UB, DB, MODE, NP, KRANK, KSURE, H,
     +   W, EB, IC, IR)
C***BEGIN PROLOGUE  U11LS
C***SUBSIDIARY
C***PURPOSE  Subsidiary to LLSIA
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (U11LS-S, DU11LS-D)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
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  LLSIA
C***ROUTINES CALLED  ISAMAX, ISWAP, SAXPY, SDOT, SNRM2, SSCAL, SSWAP,
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  U11LS