#ifdef __cplusplusextern "C" { #endif  #include "f2c.h" int dsygvx_(integer *itype, char *jobz, char *range, char *uplo, integer *n, doublereal *a, integer *lda, doublereal *b, integer *ldb, doublereal *vl, doublereal *vu, integer *il, integer *iu, doublereal *abstol, integer *m, doublereal *w, doublereal *z__, integer *ldz, doublereal *work, integer *lwork, integer *iwork, integer *ifail, integer *info);#ifdef __cplusplus}#endif