SLATEC Routines --- CHKSN4 ---

*DECK CHKSN4
      SUBROUTINE CHKSN4 (MBDCND, NBDCND, ALPHA, BETA, COFX, SINGLR)
C***BEGIN PROLOGUE  CHKSN4
C***SUBSIDIARY
C***PURPOSE  Subsidiary to SEPX4
C***LIBRARY   SLATEC
C***TYPE      SINGLE PRECISION (CHKSN4-S)
C***AUTHOR  (UNKNOWN)
C***DESCRIPTION
C
C     This subroutine checks if the PDE SEPX4
C     must solve is a singular operator.
C
C***SEE ALSO  SEPX4
C***ROUTINES CALLED  (NONE)
C***COMMON BLOCKS    SPL4
C***REVISION HISTORY  (YYMMDD)
C   801001  DATE WRITTEN
C   890531  Changed all specific intrinsics to generic.  (WRB)
C   891214  Prologue converted to Version 4.0 format.  (BAB)
C   900402  Added TYPE section.  (WRB)
C***END PROLOGUE  CHKSN4