# usecases/c/UsesCase_MEDfield_13.c

    /*  This file is part of MED.
     *
     *  COPYRIGHT (C) 1999 - 2012  EDF R&D, CEA/DEN
     *  MED is free software: you can redistribute it and/or modify
     *  it under the terms of the GNU Lesser General Public License as published by
     *  the Free Software Foundation, either version 3 of the License, or
     *  (at your option) any later version.
     *
     *  MED is distributed in the hope that it will be useful,
     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *  GNU Lesser General Public License for more details.
     *
     *  You should have received a copy of the GNU Lesser General Public License
     *  along with MED.  If not, see <http://www.gnu.org/licenses/>.
     */

    /*
     * Field use case 13 : write a field on nodes elements in a MED file
     */

    #include <med.h>
    #define MESGERR 1
    #include <med_utils.h>

    #include <string.h>

    int main (int argc, char **argv) {
      med_idt fid;
      const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
      const char fieldname[MED_NAME_SIZE+1] = "TEMPERATURE_FIELD";
      const med_int ncomponent = 1;
      const char componentname[MED_SNAME_SIZE+1] = "TEMPERATURE";
      const char componentunit[MED_SNAME_SIZE+1] = "C";
      const med_int nquad4 = 4;
      const med_float quad4values_step1[4*4] = { 10000.,  20000.,  30000.,  40000.,
                                                 50000.,  60000.,  70000.,  80000.,
                                                 90000., 100000., 110000., 120000.,
                                                 130000., 140000., 150000., 160000. };
      const med_float quad4values_step2[4*4] = { 100.,  200.,  300.,  400.,
                                                 500.,  600.,  700.,  800.,
                                                 900., 1000., 1100., 1200.,
                                                 1300., 1400., 1500., 1600. };
      int ret=-1;

      /* file creation */
      fid = MEDfileOpen("UsesCase_MEDfield_13.med",MED_ACC_CREAT);
      if (fid < 0) {
        MESSAGE("ERROR : file creation ...");
        goto ERROR;
      }

      /* create mesh link */
      if (MEDlinkWr(fid,meshname,"./UsesCase_MEDmesh_1.med") < 0) {
        MESSAGE("ERROR : create mesh link ...");
        goto ERROR;
      }

      /*
       * Temperature field  creation :
       * - 1 component
       * - component unit : celsius degree
       * - mesh is the 2D unstructured mesh of UsecaseMEDmesh_1.c use case.
       * - computation step unit in 'ms'
       */
      if (MEDfieldCr(fid, fieldname, MED_FLOAT64,
                     ncomponent, componentname, componentunit,
                     "ms", meshname) < 0) {
        MESSAGE("ERROR : create field");
        goto ERROR;
      }

      /* two computation steps */
      /* write values at nodes elements : 4 MED_QUAD4 */

      /* STEP 1 : dt1 = 5.5, it = 1*/
      /* MED_QUAD4  : with no profile */
      if (MEDfieldValueWithProfileWr(fid, fieldname, 1, 1, 5.5, MED_NODE_ELEMENT, MED_QUAD4,
                                     MED_COMPACT_PFLMODE, MED_NO_PROFILE, MED_NO_LOCALIZATION,
                                     MED_FULL_INTERLACE, MED_ALL_CONSTITUENT,
                                     nquad4, (unsigned char*) quad4values_step1) < 0) {
        MESSAGE("ERROR : write field values on MED_QUAD4 ");
        goto ERROR;
      }

      /* STEP 2 : dt2 = 8.9, it = 1*/
      /* MED_QUAD4 : with no profile */
      if (MEDfieldValueWithProfileWr(fid, fieldname, 2, 1, 8.9, MED_NODE_ELEMENT, MED_QUAD4,
                                     MED_COMPACT_PFLMODE, MED_NO_PROFILE, MED_NO_LOCALIZATION,
                                     MED_FULL_INTERLACE, MED_ALL_CONSTITUENT,
                                     nquad4, (unsigned char*) quad4values_step2) < 0) {
        MESSAGE("ERROR : write field values on MED_QUAD4 ... ");
        goto ERROR;
      }

      ret=0;
     ERROR:

      /* close file */
      if (MEDfileClose(fid) < 0) {
        MESSAGE("ERROR : close file ...");
        ret=-1;
      }

      return ret;
    }