source: issm/trunk/src/mex/InterpFromMesh2d/InterpFromMesh2d.cpp@ 1189

/*!\file InterpFromMesh2d.c
 * \brief: data interpolation from a list of (x,y,values) into mesh grids
 
        InterpFromMesh2d.c

        usage:
        data_mesh=InterpFromMesh2d(index,x,y,data,x_mesh,y_mesh);
        
        where:

                input:
                x,y: coordinates of matrix data
                data - matrix holding the data to be interpolated onto the mesh.
                x_mesh,y_mesh: coordinates of the mesh grids onto which we interpolate.
                
                output: 
                data_mesh:  vector of mesh interpolated data.

*/
        
#include "./InterpFromMesh2d.h"

void mexFunction( int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[]) {

        /*input: */
        double* index_data=NULL;
        int     index_data_rows;

        double* x_data=NULL;
        int     x_data_rows;
        
        double* y_data=NULL;
        int     y_data_rows;

        double* data=NULL; 
        int     data_rows;
        int     data_cols;

        double* x_prime=NULL;
        double* y_prime=NULL;
        
        int     x_prime_rows;
        int     y_prime_rows;

        double default_value;

        /*Intermediary*/
        int nods_data;
        int nels_data;
        int nods_prime;

        /* output: */
        Vec  data_prime=NULL;

        /*Boot module: */
        MODULEBOOT();

        /*checks on arguments on the matlab side: */
        CheckNumMatlabArguments(nlhs,NLHS,nrhs,NRHS,__FUNCT__,&InterpFromMesh2dUsage);

        /*Input datasets: */
        FetchData((void**)&index_data,&index_data_rows,NULL,INDEXHANDLE,"Matrix","Mat");
        FetchData((void**)&x_data,&x_data_rows,NULL,XHANDLE,"Matrix","Mat");
        FetchData((void**)&y_data,&y_data_rows,NULL,YHANDLE,"Matrix","Mat");
        FetchData((void**)&data,&data_rows,&data_cols,DATAHANDLE,"Matrix","Mat");
        FetchData((void**)&x_prime,&x_prime_rows,NULL,XPRIMEHANDLE,"Matrix","Mat");
        FetchData((void**)&y_prime,&y_prime_rows,NULL,YPRIMEHANDLE,"Matrix","Mat");
        FetchData((void**)&default_value,NULL,NULL,DEFAULTHANDLE,"Scalar",NULL);

        /*some checks*/
        if (x_data_rows!=y_data_rows){
                throw ErrorException(__FUNCT__,"vectors x and y should have the same length!");
        }
        if (x_prime_rows!=y_prime_rows){
                throw ErrorException(__FUNCT__,"vectors x_prime and y_prime should have the same length!");
        }
        
        /*get number of elements and number of nodes in the data*/
        nels_data=index_data_rows;
        nods_data=x_data_rows;
        nods_prime=x_prime_rows;

        /* Run core computations: */
        InterpFromMesh2dx(&data_prime,index_data,x_data,y_data,nods_data,nels_data,data,data_rows,x_prime,y_prime,nods_prime,default_value);

        /*Write data: */
        WriteData(DATAPRIME,data_prime,0,0,"Vector",NULL);

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

void InterpFromMesh2dUsage(void)
{
        _printf_("   usage:\n");
        _printf_("      data_prime=InterpFromMesh2d(index,x,y,data,x_prime,y_prime,default_value);\n\n");
        _printf_("   where:\n");
        _printf_("      x,y: coordinates of the nodes where data is defined\n");
        _printf_("      index: index of the mesh where data is defined\n");
        _printf_("      data - vector holding the data to be interpolated onto the points.\n");
        _printf_("      x_prime,y_prime: coordinates of the mesh grids onto which we interpolate.\n");
        _printf_("      default_value - default value if no interpolation is found.\n");
        _printf_("      data_prime:  vector of prime interpolated data.\n");
        _printf_("\n");
}