amd_f77cross.f
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C ======================================================================
C === AMD_cross ========================================================
C ======================================================================
C ----------------------------------------------------------------------
C AMD, Copyright (c) by Timothy A. Davis, Patrick R.
C Amestoy, and Iain S. Duff. See ../README.txt for
C License. email: davis at cise.ufl.edu CISE Department, Univ. of
C Florida. web: http://www.cise.ufl.edu/research/sparse/amd
C ----------------------------------------------------------------------
C This program provides an example of how to call the C version of AMD
C from a Fortran program. It is HIGHLY non-portable.
C The amd_order routine returns PERM (1) < 0 if an error occurs.
C (-1: out of memory, -2: invalid matrix)
C Note that the input matrix is 0-based. From Fortran, column j of the
C matrix is in AI (AP (I)+1 ... AP (I+1)). The row indices in this
C set are in the range 0 to N-1. To demonstrate this translation,
C the input matrix is printed in 1-based form. This program uses
C the same 5-by-5 test matrix as amd_simple.c.
INTEGER N, NZ, K, P
PARAMETER (N = 5, NZ = 14)
INTEGER AP (N+1), AI (NZ), PERM (N)
DATA AP / 0, 2, 6, 10, 12, 14 /
DATA AI / 0,1, 0,1,2,4, 1,2,3,4, 2,3, 1,4 /
DOUBLE PRECISION CONTROL (5), INFO (20)
C print the input matrix
PRINT 10, N, N, NZ
10 FORMAT ('Input matrix:', I2, '-by-', I2, ' with',I3,' entries')
DO 40 J = 1, N
PRINT 20, J, AP (J+1) - AP (J), AP (J)+1, AP (J+1)
20 FORMAT ( /, 'Column: ', I2, ' number of entries: ', I2,
$ ' with row indices in AI (', I3, ' ... ', I3, ')')
PRINT 30, ((AI (P) + 1), P = AP (J) + 1, AP (J+1))
30 FORMAT (' row indices: ', 24I3)
40 CONTINUE
CALL AMDDEFAULTS (CONTROL)
CALL AMDORDER (N, AP, AI, PERM, CONTROL, INFO)
CALL AMDINFO (INFO)
DO 60 K = 1, N
PRINT 50, K, PERM (K) + 1
50 FORMAT ('PERM (',I2,') = ', I2)
60 CONTINUE
END