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#include <stdio.h>
#include <math.h>
#include <arkode/arkode.h> /* prototypes for ARKODE fcts., consts. */
#include <nvector/nvector_serial.h> /* serial N_Vector types, fcts., macros */
#include <sunmatrix/sunmatrix_dense.h> /* access to dense SUNMatrix */
#include <sunlinsol/sunlinsol_dense.h> /* access to dense SUNLinearSolver */
#include <arkode/arkode_direct.h> /* access to ARKDls interface */
#include <sundials/sundials_types.h> /* definition of type realtype */
#include <sundials/sundials_math.h>
/* Check function return value...
opt == 0 means SUNDIALS function allocates memory so check if
returned NULL pointer
opt == 1 means SUNDIALS function returns a flag so check if
flag >= 0
opt == 2 means function allocates memory so check if returned
NULL pointer
*/
int check_flag(void *flagvalue, const char *funcname, int opt)
{
int *errflag;
/* Check if SUNDIALS function returned NULL pointer - no memory allocated */
if (opt == 0 && flagvalue == NULL) {
fprintf(stderr, "\nSUNDIALS_ERROR: %s() failed - returned NULL pointer\n\n",
funcname);
return 1; }
/* Check if flag < 0 */
else if (opt == 1) {
errflag = (int *) flagvalue;
if (*errflag < 0) {
fprintf(stderr, "\nSUNDIALS_ERROR: %s() failed with flag = %d\n\n",
funcname, *errflag);
return 1; }}
/* Check if function returned NULL pointer - no memory allocated */
else if (opt == 2 && flagvalue == NULL) {
fprintf(stderr, "\nMEMORY_ERROR: %s() failed - returned NULL pointer\n\n",
funcname);
return 1; }
return 0;
}
/* check the computed solution */
int check_ans(N_Vector y, realtype t, realtype rtol, realtype atol)
{
int passfail=0; /* answer pass (0) or fail (1) flag */
realtype ans, err, ewt; /* answer data, error, and error weight */
realtype ONE=RCONST(1.0);
/* compute solution error */
ans = atan(t);
ewt = ONE / (rtol * SUNRabs(ans) + atol);
err = ewt * SUNRabs(NV_Ith_S(y,0) - ans);
/* is the solution within the tolerances? */
passfail = (err < ONE) ? 0 : 1;
if (passfail) {
fprintf(stdout, "\nSUNDIALS_WARNING: check_ans error=%g \n\n", err);
}
return(passfail);
}
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