anchor.diff:                TEMP=ALPHA*Z(I,K)+BETA*Z(I,KP)
                 Z(I,KP)=ALPHA*Z(I,KP)-BETA*Z(I,K)
     120         Z(I,K)=TEMP
  +              print *, '   k, alpha, beta, tot', k, alpha, beta, tot
             END IF
             K=K-1
             GOTO 100
  
positive.code:       KK=IACT(ICON)
        DO 90 I=1,N
     90 DXNEW(I)=A(I,KK)
        TOT=0.0d0
        K=N
    100 IF (K .GT. NACT) THEN
            SP=0.0d0
            SPABS=0.0d0
  
negative.code:       SUBROUTINE TRSTLP (N,M,A,B,RHO,DX,IFULL,IACT,Z,ZDOTA,VMULTC,
       1  SDIRN,DXNEW,VMULTD,IPRINT)
        IMPLICIT DOUBLE PRECISION (A-H,O-Z)
        DOUBLE PRECISION TEMP
        DIMENSION A(N,*),B(*),DX(*),IACT(*),Z(N,*),ZDOTA(*),
       1  VMULTC(*),SDIRN(*),DXNEW(*),VMULTD(*)
  C
  