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C DRIVER FOR HYBRJ1 EXAMPLE.
C DOUBLE PRECISION VERSION
C
C **********
INTEGER J,N,LDFJAC,INFO,LWA,NWRITE
DOUBLE PRECISION TOL,FNORM
DOUBLE PRECISION X(9),FVEC(9),FJAC(9,9),WA(99)
DOUBLE PRECISION ENORM,DPMPAR
EXTERNAL FCN
C
C LOGICAL OUTPUT UNIT IS ASSUMED TO BE NUMBER 6.
C
DATA NWRITE /6/
C
N = 9
C
C THE FOLLOWING STARTING VALUES PROVIDE A ROUGH SOLUTION.
C
DO 10 J = 1, 9
X(J) = -1.D0
10 CONTINUE
C
LDFJAC = 9
LWA = 99
C
C SET TOL TO THE SQUARE ROOT OF THE MACHINE PRECISION.
C UNLESS HIGH PRECISION SOLUTIONS ARE REQUIRED,
C THIS IS THE RECOMMENDED SETTING.
C
TOL = DSQRT(DPMPAR(1))
C
CALL HYBRJ1(FCN,N,X,FVEC,FJAC,LDFJAC,TOL,INFO,WA,LWA)
FNORM = ENORM(N,FVEC)
WRITE (NWRITE,1000) FNORM,INFO,(X(J),J=1,N)
STOP
1000 FORMAT (5X,31H FINAL L2 NORM OF THE RESIDUALS,D15.7 //
* 5X,15H EXIT PARAMETER,16X,I10 //
* 5X,27H FINAL APPROXIMATE SOLUTION // (5X,3D15.7))
C
C LAST CARD OF DRIVER FOR HYBRJ1 EXAMPLE.
C
END
SUBROUTINE FCN(N,X,FVEC,FJAC,LDFJAC,IFLAG)
INTEGER N,LDFJAC,IFLAG
DOUBLE PRECISION X(N),FVEC(N),FJAC(LDFJAC,N)
C
C SUBROUTINE FCN FOR HYBRJ1 EXAMPLE.
C
INTEGER J,K
DOUBLE PRECISION ONE,TEMP,TEMP1,TEMP2,THREE,TWO,ZERO
DATA ZERO,ONE,TWO,THREE,FOUR /0.D0,1.D0,2.D0,3.D0,4.D0/
C
IF (IFLAG .EQ. 2) GO TO 20
DO 10 K = 1, N
TEMP = (THREE - TWO*X(K))*X(K)
TEMP1 = ZERO
IF (K .NE. 1) TEMP1 = X(K-1)
TEMP2 = ZERO
IF (K .NE. N) TEMP2 = X(K+1)
FVEC(K) = TEMP - TEMP1 - TWO*TEMP2 + ONE
10 CONTINUE
GO TO 50
20 CONTINUE
DO 40 K = 1, N
DO 30 J = 1, N
FJAC(K,J) = ZERO
30 CONTINUE
FJAC(K,K) = THREE - FOUR*X(K)
IF (K .NE. 1) FJAC(K,K-1) = -ONE
IF (K .NE. N) FJAC(K,K+1) = -TWO
40 CONTINUE
50 CONTINUE
RETURN
C
C LAST CARD OF SUBROUTINE FCN.
C
END
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