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SUBROUTINE COM12 (*,IX,X,DX,ITERMM)
C
C*******
C PROGRAM TO SOLVE A MATRIX OF ORDER ONE OR TWO FOR CDCOMP
C*******
DOUBLE PRECISION DX(12),DET,MINDIA,DZ,DA
INTEGER SYSBUF,RDP,DUM
INTEGER TYPEL
INTEGER CDP
INTEGER SCRFLG,JPOSL,BBAR,CBCNT,R,BBBAR1,BBBAR,
1 SR2FL,SR2FIL
DIMENSION SUB(2),X(1),IX(1)
COMMON /SYSTEM/ SYSBUF
COMMON /CDCMPX/ IFILA(7),IFILL(7),IFILU(7),DUM(3),DET(2),POWER,
1 NX,MINDIA
COMMON /NAMES / RD,RDREW,WRT,WRTREW,REW,NOREW,EOFNRW ,RSP,RDP,
1 CSP,CDP
COMMON /ZBLPKX/ DZ(2),JJ
COMMON /PACKX / ITYPE1,ITYPE2,IY,JY,INCRY
COMMON /UNPAKX/ ITYPEX,IXY,JXY,INCRX
EQUIVALENCE (IFILA(2),NCOL),(IFILL(5),TYPEL),(SR2FIL,DUM(2))
DATA SUB(1), SUB(2) / 4HCOM1,4H2 /
C
IBUF1 = NX-SYSBUF
IBUF2 = IBUF1-SYSBUF
CALL CLOSE(SR2FIL,REW)
IBUF3 = IBUF2-SYSBUF
IFILE = IFILU(1)
IF(ITERMM .EQ. 1) IFILE = SR2FIL
CALL GOPEN(IFILE,IX(IBUF3),WRTREW)
CALL GOPEN(IFILA(1),IX(IBUF1),RDREW)
ITYPEX = CDP
ITYPE1 = CDP
ITYPE2 = TYPEL
INCRX = 1
INCRY = 1
IF(NCOL .EQ. 2) GO TO 100
IF(NCOL .NE. 1) GO TO 5000
C*******
C SOLVE A (1X1)
C*******
IXY = 1
JXY = 1
CALL UNPACK(*5060,IFILA(1),DX)
DET(1) = DX(1)
DET(2) = DX(2)
MINDIA = DSQRT(DX(1)**2+DX(2)**2)
IY = 1
JY = 1
CALL PACK (DX,IFILE,IFILU)
DX(1) = 0.D0
DX(2) = 0.D0
CALL PACK (DX,IFILL(1),IFILL)
90 CALL CLOSE(IFILE,REW)
95 CALL CLOSE(IFILA(1),REW)
CALL CLOSE(IFILL(1),REW)
RETURN
100 IXY = 1
C*******
C SOLVE A (2X2)
C*******
JXY = 2
CALL UNPACK(*5060,IFILA(1),DX )
CALL UNPACK(*5060,IFILA(1),DX(5))
A = 1.
IF(DX(1)**2+DX(2)**2 .GE. DX(3)**2+DX(4)**2) GO TO 150
C*******
C PERFORM INTERCHANGE
C*******
DET(1) = DX(1)
DX(1) = DX(3)
DX(3) = DET(1)
DET(1) = DX(2)
DX(2) = DX(4)
DX(4) = DET(1)
DET(1) = DX(5)
DX(5) = DX(7)
DX(7) = DET(1)
DET(1) = DX(6)
DX(6) = DX(8)
DX(8) = DET(1)
A = -1.
150 CONTINUE
DET(1) = (DX(3)*DX(1)+DX(4)*DX(2))/(DX(1)**2+DX(2)**2)
DX(4) = (DX(4)*DX(1)-DX(3)*DX(2))/(DX(1)**2+DX(2)**2)
DX(3) = DET(1)
DX(7) = DX(7)-DX(3)*DX(5)+DX(4)*DX(6)
DX(8) = DX(8)-DX(3)*DX(6)-DX(4)*DX(5)
DET(1) = DX(1)*DX(7)-DX(2)*DX(8)
DET(2) = DX(2)*DX(7)+DX(1)*DX(8)
IF((DX(1).EQ.0.D0 .AND. DX(2).EQ.0.D0) .OR. (DX(7).EQ.0.D0.AND.
1 DX(8).EQ.0.D0)) GO TO 5060
MINDIA = DMIN1(DSQRT(DX(1)**2+DX(2)**2),DSQRT(DX(7)**2+DX(8)**2))
IY = 1
JY = 2
DX( 9) = 0.0D0
DX(10) = 0.0D0
IF(A .LT. 0.) DX(9) = 1.D0
DX(11) = DX(3)
DX(12) = DX(4)
CALL PACK(DX(9),IFILL(1),IFILL)
DX( 9) = 0.D0
DX(10) = 0.D0
JY = 1
CALL PACK(DX(9),IFILL(1),IFILL)
IF(ITERMM .EQ. 1) GO TO 160
DX(3) = DX(5)
DX(5) = DX(7)
DX(7) = DX(3)
DX(3) = DX(6)
DX(6) = DX(8)
DX(8) = DX(3)
JY = 2
CALL PACK(DX(5),IFILU(1),IFILU)
IY = 2
CALL PACK (DX,IFILU(1),IFILU)
GO TO 90
160 CALL PACK(DX,IFILE,IFILU)
JY = 2
CALL PACK(DX(5),IFILE,IFILU)
CALL CLOSE(IFILE,EOFNRW)
GO TO 95
C
C
ENTRY COMFIN (ITERM,SCRFLG,SR2FL,JPOSL,I1SP,BBAR,I1,CBCNT,
1 IPAK,R,BBBAR1,BBBAR,I6SP,I4,I4SP,IX,DX,X,LCOL)
C
IBUF1 = NX-SYSBUF
IBUF2 = IBUF1-SYSBUF
IBUF3 = IBUF2-SYSBUF
CALL CLOSE(IFILA(1),REW)
CALL OPEN(*5010,SR2FIL,IX(IBUF1),WRT)
CALL CLOSE(SR2FIL,EOFNRW)
K=0
NAME = IFILL(1)
CALL OPEN(*5010,IFILL(1),IX(IBUF2),WRT)
IF(SCRFLG.EQ.0) GO TO 2005
NAME = SR2FL
CALL OPEN(*5010,SR2FL,IX(IBUF3),RD)
2005 LL = 0
2010 JPOSL = JPOSL+1
CALL BLDPK(CDP,TYPEL,IFILL(1),0,0)
IN1 = I1SP+K
JJ = JPOSL
DZ(1) = IX(IN1)
DZ(2) = 0.D0
CALL ZBLPKI
KK = 0
IEND = MIN0(BBAR,NCOL-JJ)
IF(IEND .EQ. 0) GO TO 2030
IN1 = I1 +LL*BBAR*2
2020 JJ = JJ+1
IN2 = IN1+KK+KK
DZ(1) = DX(IN2)
DZ(2) = DX(IN2+1)
CALL ZBLPKI
KK = KK+1
IF(KK-IEND)2020,2030,5050
2030 IF(CBCNT.EQ.0) GO TO 2050
C*******
C PACK ACTIVE ROW ELEMENTS ALSO
C*******
KK = 0
2035 IN1 = I6SP + KK
IN2 = I4 +(IX(IN1)*BBBAR+K)*2
DZ(1) = DX(IN2)
DZ(2) = DX(IN2+1)
IF(DZ(1) .EQ. 0.D0 .AND. DZ(2) .EQ. 0.D0) GO TO 2040
IN1 = I4SP + IX(IN1)
JJ = IX(IN1)
CALL ZBLPKI
2040 KK = KK + 1
IF(KK .LT. CBCNT) GO TO 2035
2050 CALL BLDPKN(IFILL(1),0,IFILL)
LL = LL + 1
K = K + 1
IF (K .EQ. LCOL) GO TO 2080
IF(K-R+1)2010,2060,2070
2060 IF(R-BBBAR1)2070,2010,5050
2070 LL = LL-1
IN1 = I1+LL*BBAR*2
IBBAR4 = 4 * BBAR
CALL READ(*5020,*5030,SR2FL,DX(IN1),IBBAR4,0,NO)
GO TO 2010
2080 CALL CLOSE(IFILL(1),REW)
IF(SCRFLG.GT.0)CALL CLOSE(SR2FL,REW)
IF(ITERM .NE. 0) RETURN
C*******
C RE-WRITE THE UPPER TRIANGLE WITH THE RECORDS IN THE REVERSE ORDER
C*******
INCRX = 1
INCRY = 1
ITYPE1 = TYPEL
ITYPE2 = TYPEL
ITYPEX = TYPEL
IFILU(2) = 0
IFILU(6) = 0
IFILU(7) = 0
NAME = SR2FIL
CALL OPEN(*5010,SR2FIL,IX(IBUF1),RD)
CALL GOPEN(IFILU(1),IX(IBUF2),WRTREW)
DO 2300 I = 1,NCOL
IXY = 0
CALL BCKREC(SR2FIL)
CALL UNPACK(*5060,SR2FIL,IX)
CALL BCKREC(SR2FIL)
KK = JXY-IXY+1
K = KK/2
KK = KK + 1
IF(TYPEL .EQ. 1) GO TO 2095
IF(TYPEL .EQ. 4) GO TO 2061
DO 2090 J = 1,K
L = KK-J
DA = DX(J)
DX(J) = DX(L)
2090 DX(L) = DA
GO TO 2100
2061 KK = KK+KK-1
K = K+K
DO 2092 J = 1,K,2
L = KK-J-1
DA = DX(L)
DX(L) = DX(J)
DX(J) = DA
DA = DX(L+1)
DX(L+1) = DX(J+1)
2092 DX(J+1) = DA
GO TO 2100
2095 DO 2097 J = 1,K
L = KK-J
A = X(J)
X(J) = X(L)
2097 X(L) = A
2100 IY = NCOL-JXY+1
JY = NCOL-IXY+1
CALL PACK(IX,IFILU(1),IFILU)
2300 CONTINUE
CALL CLOSE(IFILU(1),REW)
CALL CLOSE(SR2FIL,REW)
RETURN
5000 NO = -8
GO TO 5500
5010 NO = -1
GO TO 5500
5020 NO = -2
GO TO 5500
5030 NO = -3
GO TO 5500
5050 NO = -25
GO TO 5500
5060 RETURN 1
5500 CALL MESAGE(NO,NAME,SUB(1))
RETURN
END
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