SLATEC Routines --- ORTHO4 ---

*DECK ORTHO4
      SUBROUTINE ORTHO4 (USOL, IDMN, ZN, ZM, PERTRB)
C***BEGIN PROLOGUE  ORTHO4
C***SUBSIDIARY
C***PURPOSE  Subsidiary to SEPX4
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (ORTHO4-S)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
C
C     This subroutine orthogonalizes the array USOL with respect to
C     the constant array in a weighted least squares norm.
C
C***SEE ALSO  SEPX4
C***ROUTINES CALLED  (NONE)
C***COMMON BLOCKS    SPL4
C***REVISION HISTORY  (YYMMDD)
C   801001  DATE WRITTEN
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  ORTHO4