18be712e4SBarry Smith /* degree.f -- translated by f2c (version 19931217).*/ 28be712e4SBarry Smith 38be712e4SBarry Smith #include <petsc/private/matorderimpl.h> 48be712e4SBarry Smith 58be712e4SBarry Smith /*****************************************************************/ 68be712e4SBarry Smith /********* DEGREE ..... DEGREE IN MASKED COMPONENT *********/ 78be712e4SBarry Smith /*****************************************************************/ 88be712e4SBarry Smith 98be712e4SBarry Smith /* PURPOSE - THIS ROUTINE COMPUTES THE DEGREES OF THE NODES*/ 108be712e4SBarry Smith /* IN THE CONNECTED COMPONENT SPECIFIED BY MASK AND ROOT*/ 118be712e4SBarry Smith /* NODES FOR WHICH MASK IS ZERO ARE IGNORED.*/ 128be712e4SBarry Smith 138be712e4SBarry Smith /* INPUT PARAMETER -*/ 148be712e4SBarry Smith /* ROOT - IS THE INPUT NODE THAT DEFINES THE COMPONENT.*/ 158be712e4SBarry Smith /* (XADJ, ADJNCY) - ADJACENCY STRUCTURE PAIR.*/ 168be712e4SBarry Smith /* MASK - SPECIFIES A SECTION SUBGRAPH.*/ 178be712e4SBarry Smith 188be712e4SBarry Smith /* OUTPUT PARAMETERS -*/ 198be712e4SBarry Smith /* DEG - ARRAY CONTAINING THE DEGREES OF THE NODES IN*/ 208be712e4SBarry Smith /* THE COMPONENT.*/ 218be712e4SBarry Smith /* CCSIZE-SIZE OF THE COMPONENT SPECIFIED BY MASK AND ROOT*/ 228be712e4SBarry Smith /* WORKING PARAMETER -*/ 238be712e4SBarry Smith /* LS - A TEMPORARY VECTOR USED TO STORE THE NODES OF THE*/ 248be712e4SBarry Smith /* COMPONENT LEVEL BY LEVEL.*/ 258be712e4SBarry Smith /*****************************************************************/ 268be712e4SBarry Smith PetscErrorCode SPARSEPACKdegree(const PetscInt *root, const PetscInt *inxadj, const PetscInt *adjncy, PetscInt *mask, PetscInt *deg, PetscInt *ccsize, PetscInt *ls) 278be712e4SBarry Smith { 288be712e4SBarry Smith PetscInt *xadj = (PetscInt *)inxadj; /* Used as temporary and reset within this function */ 298be712e4SBarry Smith /* System generated locals */ 308be712e4SBarry Smith PetscInt i__1, i__2; 318be712e4SBarry Smith 328be712e4SBarry Smith /* Local variables */ 338be712e4SBarry Smith PetscInt ideg, node, i, j, jstop, jstrt, lbegin, lvlend, lvsize, nbr; 348be712e4SBarry Smith /* INITIALIZATION ...*/ 358be712e4SBarry Smith /* THE ARRAY XADJ IS USED AS A TEMPORARY MARKER TO*/ 368be712e4SBarry Smith /* INDICATE WHICH NODES HAVE BEEN CONSIDERED SO FAR.*/ 378be712e4SBarry Smith 388be712e4SBarry Smith PetscFunctionBegin; 398be712e4SBarry Smith /* Parameter adjustments */ 408be712e4SBarry Smith --ls; 418be712e4SBarry Smith --deg; 428be712e4SBarry Smith --mask; 438be712e4SBarry Smith --adjncy; 448be712e4SBarry Smith --xadj; 458be712e4SBarry Smith 468be712e4SBarry Smith ls[1] = *root; 478be712e4SBarry Smith xadj[*root] = -xadj[*root]; 488be712e4SBarry Smith lvlend = 0; 498be712e4SBarry Smith *ccsize = 1; 508be712e4SBarry Smith /* LBEGIN IS THE POINTER TO THE BEGINNING OF THE CURRENT*/ 518be712e4SBarry Smith /* LEVEL, AND LVLEND POINTS TO THE END OF THIS LEVEL.*/ 528be712e4SBarry Smith L100: 538be712e4SBarry Smith lbegin = lvlend + 1; 548be712e4SBarry Smith lvlend = *ccsize; 558be712e4SBarry Smith /* FIND THE DEGREES OF NODES IN THE CURRENT LEVEL,*/ 568be712e4SBarry Smith /* AND AT THE SAME TIME, GENERATE THE NEXT LEVEL.*/ 578be712e4SBarry Smith i__1 = lvlend; 588be712e4SBarry Smith for (i = lbegin; i <= i__1; ++i) { 598be712e4SBarry Smith node = ls[i]; 608be712e4SBarry Smith jstrt = -xadj[node]; 618be712e4SBarry Smith i__2 = xadj[node + 1]; 62*835f2295SStefano Zampini jstop = PetscAbsInt(i__2) - 1; 638be712e4SBarry Smith ideg = 0; 648be712e4SBarry Smith if (jstop < jstrt) goto L300; 658be712e4SBarry Smith i__2 = jstop; 668be712e4SBarry Smith for (j = jstrt; j <= i__2; ++j) { 678be712e4SBarry Smith nbr = adjncy[j]; 688be712e4SBarry Smith if (!mask[nbr]) goto L200; 698be712e4SBarry Smith ++ideg; 708be712e4SBarry Smith if (xadj[nbr] < 0) goto L200; 718be712e4SBarry Smith xadj[nbr] = -xadj[nbr]; 728be712e4SBarry Smith ++(*ccsize); 738be712e4SBarry Smith ls[*ccsize] = nbr; 748be712e4SBarry Smith L200:; 758be712e4SBarry Smith } 768be712e4SBarry Smith L300: 778be712e4SBarry Smith deg[node] = ideg; 788be712e4SBarry Smith } 798be712e4SBarry Smith /* COMPUTE THE CURRENT LEVEL WIDTH. */ 808be712e4SBarry Smith /* IF IT IS NONZERO, GENERATE ANOTHER LEVEL.*/ 818be712e4SBarry Smith lvsize = *ccsize - lvlend; 828be712e4SBarry Smith if (lvsize > 0) goto L100; 838be712e4SBarry Smith /* RESET XADJ TO ITS CORRECT SIGN AND RETURN. */ 848be712e4SBarry Smith i__1 = *ccsize; 858be712e4SBarry Smith for (i = 1; i <= i__1; ++i) { 868be712e4SBarry Smith node = ls[i]; 878be712e4SBarry Smith xadj[node] = -xadj[node]; 888be712e4SBarry Smith } 898be712e4SBarry Smith PetscFunctionReturn(PETSC_SUCCESS); 908be712e4SBarry Smith } 91