* F03AEF Example Program Text * Mark 15 Revised. NAG Copyright 1991. * .. Parameters .. INTEGER NMAX, IA DOUBLE PRECISION TWO PARAMETER (NMAX=8,IA=NMAX,TWO=2.0D0) INTEGER NIN, NOUT PARAMETER (NIN=5,NOUT=6) * .. Local Scalars .. DOUBLE PRECISION D1, DETERM INTEGER I, ID, IFAIL, J, N * .. Local Arrays .. DOUBLE PRECISION A(IA,NMAX), P(NMAX) * .. External Subroutines .. EXTERNAL F03AEF * .. Executable Statements .. WRITE (NOUT,*) 'F03AEF Example Program Results' * Skip heading in data file READ (NIN,*) READ (NIN,*) N WRITE (NOUT,*) IF (N.GE.0 .AND. N.LE.NMAX) THEN READ (NIN,*) ((A(I,J),J=1,N),I=1,N) IFAIL = 0 * CALL F03AEF(N,A,IA,P,D1,ID,IFAIL) * WRITE (NOUT,*) 'Array A after factorization' DO 20 I = 1, N WRITE (NOUT,99998) (A(I,J),J=1,N) 20 CONTINUE WRITE (NOUT,*) WRITE (NOUT,*) 'Array P' WRITE (NOUT,99998) (P(I),I=1,N) WRITE (NOUT,*) WRITE (NOUT,99997) 'D1 = ', D1, ' ID = ', ID DETERM = D1*TWO**ID WRITE (NOUT,*) WRITE (NOUT,99997) 'Value of determinant = ', DETERM ELSE WRITE (NOUT,99999) 'N is out of range: N = ', N END IF STOP * 99999 FORMAT (1X,A,I5) 99998 FORMAT (1X,8F9.4) 99997 FORMAT (1X,A,F9.4,A,I2) END