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#ifndef SPECTRA_ARPACKFUN_H
#define SPECTRA_ARPACKFUN_H
#define F77_CALL(x) x##_
#define F77_NAME(x) F77_CALL(x)
enum BMAT
{
BMAT_I = 0,
BMAT_G
};
enum WHICH
{
WHICH_LM = 0,
WHICH_SM,
WHICH_LR,
WHICH_SR,
WHICH_LI,
WHICH_SI,
WHICH_LA,
WHICH_SA,
WHICH_BE
};
enum HOWMNY
{
HOWMNY_A = 0,
HOWMNY_P,
HOWMNY_S
};
extern "C" {
// ARPACK Fortran functions
void F77_NAME(dsaupdwr)(int *ido, int *bmati, int *n, int *whichi,
int *nev, double *tol, double *resid,
int *ncv, double *v, int *ldv,
int *iparam, int *ipntr, double *workd,
double *workl, int *lworkl, int *info);
void F77_NAME(dseupdwr)(int *rvec, int *howmnyi, int *select, double *d,
double *z, int *ldz, double *sigma, int *bmati,
int *n, int *whichi, int *nev, double *tol,
double *resid, int *ncv, double *v, int *ldv,
int *iparam, int *ipntr, double *workd, double *workl,
int *lworkl, int *info);
void F77_NAME(dnaupdwr)(int *ido, int *bmati, int *n, int *whichi,
int *nev, double *tol, double *resid,
int *ncv, double *v, int *ldv,
int *iparam, int *ipntr, double *workd,
double *workl, int *lworkl, int *info);
void F77_NAME(dneupdwr)(int *rvec, int *howmnyi, int *select, double *dr, double *di,
double *z, int *ldz, double *sigmar, double *sigmai, double *workev,
int *bmati, int *n, int *whichi, int *nev, double *tol,
double *resid, int *ncv, double *v, int *ldv, int *iparam,
int *ipntr, double *workd, double *workl, int *lworkl, int *info);
} // extern "C"
// Map char *which to enum type
// WHICH_LM is the default if unusual case happens
inline int whichenum(char *which)
{
switch (which[0])
{
case 'L':
switch (which[1])
{
case 'M':
return (int) WHICH_LM;
case 'R':
return (int) WHICH_LR;
case 'I':
return (int) WHICH_LI;
case 'A':
return (int) WHICH_LA;
default:
return (int) WHICH_LM;
}
case 'S':
switch (which[1])
{
case 'M':
return (int) WHICH_SM;
case 'R':
return (int) WHICH_SR;
case 'I':
return (int) WHICH_SI;
case 'A':
return (int) WHICH_SA;
default:
return (int) WHICH_LM;
}
case 'B':
if (which[1] == 'E')
return (int) WHICH_BE;
else
return (int) WHICH_LM;
default:
return (int) WHICH_LM;
}
return (int) WHICH_LM;
}
// C++ Wrapper of the functions above
inline void saupd(int &ido, char bmat, int n, char *which,
int nev, double &tol, double resid[],
int ncv, double v[], int ldv,
int iparam[], int ipntr[], double workd[],
double workl[], int lworkl, int &info)
{
int bmati = (bmat == 'G') ? BMAT_G : BMAT_I;
int whichi = whichenum(which);
F77_CALL(dsaupdwr)
(&ido, &bmati, &n, &whichi,
&nev, &tol, resid,
&ncv, v, &ldv,
iparam, ipntr, workd,
workl, &lworkl, &info);
}
inline void seupd(bool rvec, char howmny, double d[],
double z[], int ldz, double sigma, char bmat,
int n, char *which, int nev, double tol,
double resid[], int ncv, double v[], int ldv,
int iparam[], int ipntr[], double workd[], double workl[],
int lworkl, int &info)
{
int rvec_pass = (int) rvec;
int *select_pass = new int[ncv];
double *z_pass = (z == NULL) ? v : z;
int howmnyi = (howmny == 'P') ? HOWMNY_P : ((howmny == 'S') ? HOWMNY_S : HOWMNY_A);
int bmati = (bmat == 'G') ? BMAT_G : BMAT_I;
int whichi = whichenum(which);
F77_CALL(dseupdwr)
(&rvec_pass, &howmnyi, select_pass, d,
z_pass, &ldz, &sigma, &bmati,
&n, &whichi, &nev, &tol,
resid, &ncv, v, &ldv,
iparam, ipntr, workd, workl,
&lworkl, &info);
delete[] select_pass;
}
inline void naupd(int &ido, char bmat, int n, char *which,
int nev, double &tol, double resid[],
int ncv, double v[], int ldv,
int iparam[], int ipntr[], double workd[],
double workl[], int lworkl, int &info)
{
int bmati = (bmat == 'G') ? BMAT_G : BMAT_I;
int whichi = whichenum(which);
F77_CALL(dnaupdwr)
(&ido, &bmati, &n, &whichi,
&nev, &tol, resid,
&ncv, v, &ldv,
iparam, ipntr, workd,
workl, &lworkl, &info);
}
inline void neupd(bool rvec, char howmny, double dr[], double di[],
double z[], int ldz, double sigmar, double sigmai, double workev[],
char bmat, int n, char *which, int nev, double tol,
double resid[], int ncv, double v[], int ldv, int iparam[],
int ipntr[], double workd[], double workl[], int lworkl, int &info)
{
int rvec_pass = (int) rvec;
int *select_pass = new int[ncv];
double *z_pass = (z == NULL) ? v : z;
int howmnyi = (howmny == 'P') ? HOWMNY_P : ((howmny == 'S') ? HOWMNY_S : HOWMNY_A);
int bmati = (bmat == 'G') ? BMAT_G : BMAT_I;
int whichi = whichenum(which);
F77_CALL(dneupdwr)
(&rvec_pass, &howmnyi, select_pass, dr, di,
z_pass, &ldz, &sigmar, &sigmai, workev,
&bmati, &n, &whichi, &nev, &tol,
resid, &ncv, v, &ldv, iparam,
ipntr, workd, workl, &lworkl, &info);
delete[] select_pass;
}
#endif // SPECTRA_ARPACKFUN_H
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