xref: /libCEED/tests/t206-elemrestriction.c (revision de996c553fbfe0e3ee86e746b77cddce8b7779ff)

/// @file
/// Test creation, transpose use, and destruction of a multicomponent element restriction
/// \test Test creation, transpose use, and destruction of a multicomponent element restriction
#include <ceed.h>

int main(int argc, char **argv) {
  Ceed ceed;
  CeedVector x, y;
  CeedInt ne = 5, mult;
  CeedInt ind[2*ne];
  CeedScalar a[2*(ne*2)];
  const CeedScalar *yy;
  CeedElemRestriction r;

  CeedInit(argv[1], &ceed);

  // Setup
  CeedVectorCreate(ceed, 2*(ne*2), &x);
  for (CeedInt i=0; i<ne; i++) {
    for (CeedInt n=0; n<2; n++) {
      a[i*4+n] = 10+(2*i+n+1)/2;
      a[i*4+n+2] = 20+(2*i+n+1)/2;
    }
  }
  CeedVectorSetArray(x, CEED_MEM_HOST, CEED_USE_POINTER, a);

  for (CeedInt i=0; i<ne; i++) {
    ind[2*i+0] = i;
    ind[2*i+1] = i+1;
  }
  CeedElemRestrictionCreate(ceed, ne, 2, ne+1, 2, CEED_MEM_HOST, CEED_USE_POINTER,
                            ind, &r);
  CeedVectorCreate(ceed, 2*(ne+1), &y);
  CeedVectorSetValue(y, 0); // Allocates array

  // Restrict
  CeedElemRestrictionApply(r, CEED_TRANSPOSE, CEED_NOTRANSPOSE, x, y,
                           CEED_REQUEST_IMMEDIATE);

  // Check
  CeedVectorGetArrayRead(y, CEED_MEM_HOST, &yy);
  for (CeedInt i=0; i<ne+1; i++) {
    mult = i>0&&i<ne ? 2 : 1;
    if (yy[i] != (10+i)*mult)
      // LCOV_EXCL_START
      printf("Error in restricted array y[%d] = %f != %f\n",
             i, (double)yy[i], (10.+i)*mult);
      // LCOV_EXCL_STOP
    if (yy[i+ne+1] != (20+i)*mult)
      // LCOV_EXCL_START
      printf("Error in restricted array y[%d] = %f != %f\n",
             i+ne+1, (double)yy[i+ne+1], (20.+i)*mult);
      // LCOV_EXCL_STOP
  }

  CeedVectorRestoreArrayRead(y, &yy);
  CeedVectorDestroy(&x);
  CeedVectorDestroy(&y);
  CeedElemRestrictionDestroy(&r);
  CeedDestroy(&ceed);
  return 0;
}