source: issm/trunk/src/wrappers/MeshPartition/MeshPartition.cpp@ 22758

/*!\file:  MeshPartition.cpp
 * \brief: partition mesh according to number of areas, using Metis library.
*/

#include "./MeshPartition.h"

void MeshPartitionUsage(void){/*{{{*/
        _printf_("   usage:\n");
        _printf_("   [element_partitioning,node_partitioning]=MeshPartition(md.mesh,numpartitions)");
        _printf_("   where:\n");
        _printf_("      element_partitioning is a vector of partitioning area numbers, for every element.\n");
        _printf_("      node_partitioning is a vector of partitioning area numbers, for every node.\n");
        _printf_("\n");
}/*}}}*/
WRAPPER(MeshPartition_python){

        /* required input: */
        int  numberofelements;
        int  numberofvertices;
        int *elements = NULL;
        int  elements_width;
        int numberofelements2d=0;
        int numberofvertices2d=0;
        int* elements2d=NULL;
        int numberoflayers;
        int numareas=1;

        /* output: */
        int    *int_element_partitioning = NULL;
        int    *int_node_partitioning    = NULL;
        double *element_partitioning     = NULL;
        double *node_partitioning        = NULL;

        /*Boot module: */
        MODULEBOOT();

        /*checks on arguments on the matlab side: */
        CHECKARGUMENTS(NLHS,NRHS,&MeshPartitionUsage);

        /*Fetch data: */
        FetchData(&numberofvertices,NUMBEROFVERTICES);
        FetchData(&elements,&numberofelements,&elements_width,ELEMENTS);
        FetchData(&numberofvertices2d,NUMBEROFVERTICES2D);
        FetchData(&elements2d,&numberofelements2d,NULL,ELEMENTS2D);
        FetchData(&numberoflayers,NUMBEROFLAYERS);
        FetchData(&numareas,NUMAREAS);

        /*Get mesh element type and convert to Enum*/
        char* meshtype_str = NULL;
        FetchData(&meshtype_str,MESHELEMENTTYPE);
        int meshelementtype = StringToEnumx(meshtype_str); 
        xDelete<char>(meshtype_str);

        /*Run partitioning algorithm based on a "clever" use of the Metis partitioner: */
        MeshPartitionx(&int_element_partitioning,&int_node_partitioning,numberofelements,numberofvertices,elements,
                numberofelements2d,numberofvertices2d,elements2d,numberoflayers,elements_width,meshelementtype,numareas);

        /*Post process node_partitioning and element_partitioning to be in double format. Metis needed them in int* format: */
        element_partitioning=xNew<double>(numberofelements);
        for(int i=0;i<numberofelements;i++){
                element_partitioning[i]=(double)int_element_partitioning[i]+1; //Metis indexing from 0, matlab from 1.
        }

        node_partitioning=xNew<double>(numberofvertices);
        for(int i=0;i<numberofvertices;i++){
                node_partitioning[i]=(double)int_node_partitioning[i]+1; //Metis indexing from 0, matlab from 1.
        }

        /*Write data:*/
        WriteData(ELEMENTPARTITIONING,element_partitioning,numberofelements);
        WriteData(NODEPARTITIONING,node_partitioning,numberofvertices);

        /*Free ressources:*/
        xDelete<int>(elements);
        xDelete<int>(elements2d);
        xDelete<int>(int_element_partitioning);
        xDelete<int>(int_node_partitioning);
        xDelete<double>(element_partitioning);
        xDelete<double>(node_partitioning);

        /*end module: */
        MODULEEND();
}